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[…]or so. The Eggs If all goes well, you will one morning find yourself in possession of thousands of eggs. It is wise to plan ahead and arrange for friends or nature centers to take some of the eggs, as crowded conditions can cause the loss of the entire clutch. […]
[…]gray foxes, night herons, alligators and other animals prey upon iguanas, only raccoons take eggs, hatchlings and sub-adults in significant numbers. Iguanas…Here to Stay? Young iguanas are now especially common at the site, pointing towards an even greater population increase in the future. Hand-collection, although possible, is a daunting task, […]
[…]for a period of 8 years or so. Gravid females seek secluded, moist sites in which to lay their eggs; damp sphagnum moss within a cave, flower pot, or cork bark retreat is ideal. Some individuals seem to prefer elevated nest sites; perhaps in the wild eggs are sometimes deposited […]
[…]occupied by the endangered burrowing owl (Athene cunicularia), displacing the birds and destroying eggs and chicks in the process. Ever hungry, the 4-6 foot long behemoths also assist the spread of undesirable invasive plants by eating their fruits and dispersing the seeds in their feces. Among one of their most […]
Surinam toads are well known for their bizarre reproductive strategy (please see article below), unusual appearance, large size and unique habitats. They make very interesting pets but, as most in the trade are wild-caught, present a few problems when first introduced into the aquarium. Last time we took a […]
[…]that frequent these areas. Diet Bats, mice, rats, squirrels and other mammals, birds and their eggs, treefrogs and lizards. Prey is killed by constriction; the tail is highly prehensile, allowing for long strikes at fast-moving, arboreal prey. There is some evidence that, especially in young animals, the red-tipped tail is […]
[…]air pump that provides just enough aeration to keep the eggs slightly in motion. Providing Cover Axolotl eggs are typically attached to plants or other structures, as seen in the accompanying photo. Once they begin to hatch, I’ll add additional plants, nearly filling the tank so as to separate the larvae […]
[…]need further information. Veterinary intervention may be required if the female refuses to lay her eggs. In many cases, an injection of oxytosin is effective in causing the eggs to be expelled. Further Reading I’ve written about my experiences with wild green iguanas in another article on this blog. Please […]
[…]Hooks along the edges of the sperm packet latch onto the female’s genital opening, and the eggs are then fertilized internally. Gestation and Birth Gestation is highly variable, ranging from 7-10 months on average but sometimes exceeding 1 year. It is likely that stress, temperature and other factors play a […]
[…]ago – they have bred several times and show no signs of slowing down. They do not lay eggs, but rather give birth to live larvae. Some populations, particularly those living at high elevations, give birth to fully formed little salamanders, skipping the larval stage completely. How I Keep and […]
[…]of Grenada report that female Mexican lance-headed rattlesnakes frequently consume infertile eggs and non-living young after giving birth. This is said to be the first documented case of cannibalism among rattlesnakes (please see below for my observations, however). Interestingly, with a sole exception, the females did not consume young that […]
[…]become involved in all aspects of marine turtle field work – counting and re-locating eggs, monitoring nest success, and, most thrilling of all, tagging the huge females at night as they finish nesting (often carried out while mounted on the turtle as she scrambles for the sea!). Depending upon the […]
[…]cool (January-February in some areas), during much of the breeding season, and while incubating eggs. They are well adapted to long fasts, and frequently go off-feed in captivity. This can occur even in captive-hatched animals, tuned, perhaps, to an internally-controlled cycle, and is rarely a cause for concern. Individuals that […]
[…]eggs are a great concern among many captive amphibians, although I have not run into such with axolotls. The Eggs Please see the Natural History of Axolotls for details on courtship and mating. Females have been observed to pick up several spermatophores during the night, although it is not clear all are […]
[…]Choke Hazards I came upon the idea of using the Cone Worm Feeder many years ago when raising axolotl and red-spotted newt larvae. I fed them largely upon live blackworms, which always clump together, even when finely chopped. I found that larvae of both species sometimes choked to death while […]
[…]useful food items are land snails (available in seafood markets), tomato hornworms, hard boiled eggs (in moderation, i.e. once monthly) and canned grasshoppers , silkworms and snails. Pink and fuzzy mice (these are preferable to adult mice and rats) may be offered every 10-14 days. My Observations of Wild Black […]
[…]the “normal” rules…at least not as I learned them! Recently, bio-engineered axolotls that glow fluorescent green have appeared in the trade. Rearing axolotls in the lab differs in some respects from home care, but much of value is contained in the protocols of institutions maintaining large research colonies. You can […]
[…]bulb is best used for illumination, as it will not add significantly to water temperature. Axolotls do not need a source of UVB light. Axolotls are native to cool, high-altitude lakes, and do best at water temperatures of 62-70 F, with a dip to 50-52 F in winter, if possible. […]
[…]female roaches are, in essence, “trading” flight for the ability to produce additional eggs. Males of some species are though to retain the power of flight so as to be able to cover more ground when searching for mates. A description of the journal Cockroach Studies, along with photos of […]
[…]dose and a soak time of approximately 1 hour – gradually increasing both if necessary. For eggs, I dilute the Methylene Blue in water and then use an eye dropper to place it on the eggs (approximately 1 drop per 2 inch square of egg mass). Treated amphibians will be […]
[…]species have been shown to actively raise the temperature of their clutch by coiling about the eggs and “shivering”. In captive situations, I have observed incubating female blood pythons (Python curtus) and Burmese pythons (P. molurus bivittatus) to raise their eggs by 7F above the ambient air temperature. Field research […]
[…]species have been shown to actively raise the temperature of their clutch by coiling about the eggs and “shivering”. In captive situations, I have observed incubating female blood pythons (Python curtus) and Burmese pythons (P. molurus bivittatus) to raise their eggs by 7F above the ambient air temperature. Field research […]
[…]Environment This turtle spends most of it’s time in the water, leaving only to bask or lay eggs. An adult male or smaller female (some females top out at 12 inches, while others attain 18 inches in length) will require an aquarium of at least 100 gallons in capacity, but […]
[…]cyclic changes in temperature, light and humidity levels. Watch for young animals, as undetected eggs may hatch within the terrarium. Green anoles originating from the northern portions of the range require longer and cooler “winters” than do those from the south. In fact, southern-range animals are different, physiologically, from those […]
[…]insects and other invertebrates and small fish. Adults are major predators upon small axolotls and axolotl eggs. The larvae are largely carnivorous, but may consume some algae as well. Their main predators are herons and other wading birds, fishes and larger axolotls. Reproduction Males deposit spermatophores (sperm-filled capsules) on the […]
[…]subject. Please note: the aquatic larvae of all species of salamanders are termed “axolotls” in some references, i.e. as in “tiger salamander axolotls”. The name as used here refers to young and adult Ambystoma mexicanum only. Classification Class: Amphibia Order: Caudata Family: Ambystomatidae A complex of a dozen or more […]
[…]I mentioned began calling in response to increased showers, but the females did not respond with eggs. As most green treefrogs in the trade hail from Florida and Louisiana, a dry period followed by frequent misting and a rise in temperature of 5-10 F might do the trick. You can […]
[…]were likely 60-70 years old. Several times I was called to Kennedy Airport to identify turtle eggs found in luggage (and, in one case, filling 2 shopping bags!). Twice I was tempted to identify seized eggs as belonging to a sea turtle, but upon close examination and some research into […]
[…]captiulum’s collar is a favored food of ants of the genus Leptomyrmex. The ants carry the eggs into their nest, where the collar is eaten. The stick insect’s eggs are then discarded in the ant colony’s underground rubbish pile, where, protected from predators and the fires that regularly ravage the […]
[…]captive breeding seemed to have occurred in the 1950’s. Courtship and Fertilization of the Eggs One female was in breeding condition, as evidenced by the circular, swollen ring about her cloaca and the dark brood patch on her back. Several males were giving forth their metallic, clicking breeding calls, so […]
[…]however, the male African bullfrog turns his pugnacious nature towards defending his numerous eggs and tadpoles, and he is fearless in that task. I have seen footage of one leaping at the faces of African lions that had shown interest in his precious charges (the lions were only about 2 […]
[…]early 60’s. I knew enough to bypass the recommended diet of “sugar water and dried ant eggs” but was ignorant of the beast’s UVB requirements. I did, however, gather that it craved sunlight, and during one basking trip the lizard escaped up a caterpillar- laden apple tree where, I hope, […]
[…]moves against her, stiffens, and vibrates. This stimulates the female to release 1-5 unfertilized eggs, which comprise the tadpole’s sole diet. She visits and feeds each of her offspring, every other day or so, for the 43-52 days that they remain in the tadpole stage…no wonder these tiny moms eat […]
[…]Additional clutches of 1-2 eggs are laid throughout the breeding season, to a total of 8-10 eggs per female. The eggs hatch in 30-45 […]
[…]the weight (and date) on the cover. The cover should not be ventilated – for most reptile eggs, a once- daily check provides enough oxygen exchange (ventilation may need to be increased for large numbers of eggs once hatching time nears – please write in if unsure). Keeping Track of […]
[…]species. Mine thrive upon waxworms, crickets, crayfish, super mealworms, roaches, chicks and quail eggs. Pink mice are given every two weeks or so. Canned insects and monitor diets are often accepted and should be included as a source of dietary variety. Breeding Females lay 2-6 eggs at a time, and […]
[…]young tree kangaroos, naked-tailed rats, bandicoots, bats and other mammals, birds and their eggs, frogs, snakes, lizards and carrion. Captives do well on rats, mice, chicks, crayfish, large roaches and hard-boiled eggs. Image referenced from Wikipedia. Check back on Friday for more Monitor Species […]
[…]usually occurs within a month after the snakes are returned to optimal temperatures, with 6-10 eggs being deposited 40-60 days thereafter. The eggs hatch in 55-62 days when incubated at 80-84 F and 95% humidity. The hatchlings average 12-16 inches long, and shed within their first 2 weeks. In contrast […]
[…]rodent control measure. Diet Squirrels, rats, mice, bats and other small mammals, birds and their eggs; hatchlings feed largely upon treefrogs and lizards. Prey is overcome by constriction. Reproduction The 6-10 eggs are laid in May-June, but other than that reproduction in the wild is not well documented. Please see […]
[…]by grappling, often rising onto their hind legs during tests of strength. All species lay eggs. Diet All monitors are alert, effective predators, with the various species taking an incredibly huge array of prey – termites and other insects, snails, spiders, crayfish and other invertebrates, birds and their eggs, frogs, […]
Harvard biologist David Blachurn knew he was onto something unusual when a benign-looking frog he was examining in Cameroon, West Africa kicked out and left him with a bleeding cut. Unusual indeed – an article (23 August 2008) in Biology Letters describes the hidden claws of Perret’s night frog as […]
[…]also take the eggs and chicks of doves, quail and other ground-nesting birds, lizards and their eggs, tortoise eggs, locusts and other large insects and carrion. These lizards are well-adapted to a harsh environment in which food is often scarce. They gorge when food is available, consuming up to 50% […]
[…]of these have evolved a primitive placenta. Many oviparous (egg-laying) skinks guard their eggs, and there is evidence that females may move the egg clutch in response to disturbances. A Few That Break the Mold Quite a few skink species depart from the group’s typical body plan and lifestyle. New […]
[…]to show such reproductive flexibility. When breeding near shaded ponds, hourglass frogs lay their eggs on tree leaves overhanging the water (the tadpoles drop into the water upon hatching), thus avoiding fish and other aquatic predators. However, when utilizing ponds exposed to the sun, the majority of the frogs lay […]
[…]lizards ate just about everything they came across – other lizards, snakes, turtle and bird eggs, small mammals, fish, frogs, crabs, large insects and carrion – and were major predators in this flooded grassland habitat. I managed to catch a few young tegus, but old, battle-scarred individuals were impossible to […]
[…]the conditions that may have led to the prolapse – dehydration, constipation, straining to expel eggs and trauma caused by scent marking (rubbing the cloaca along the substrate) – are most common. Of course, environmental conditions must be evaluated with each species’ biology in mind – conditions that are suitable […]
[…]water and in waters containing high fish populations. Large females may lay as many as 36,000 eggs, attached in strings to aquatic vegetation. In contrast to most frogs, both eggs and tadpoles are protected by virulent toxins. The tadpoles take 10 days to 6 months to transform, depending upon temperature […]
[…]territorial disputes. Mating coincides with the start of the rainy season. Females bury 8-14 eggs in the ground, and may produce 2 clutches each year if food is plentiful. The eggs hatch in approximately 69 days and the young average 2 inches in length. Hatchlings stay in close proximity to […]
[…]by consuming tiny flies, ants and other insects that might parasitize the tarantula or consume its eggs. The toad, in return, receives a safe, moist home and the protection of an aggressive predator. Scores of other tarantulas and spiders, as well as scorpions, millipedes, pill bugs, centipedes, mantids, roaches […]
[…]Cuban natives have been transported around the world, hidden among plants and soil. Their eggs are laid on land, and the tadpole stage is passed within the egg, so the frogs readily establish themselves in greenhouses and other warm, humid habitats. It always pays to (discretely) poke around in walk-through […]
[…]take this into their cloaca (reproductive opening) and fertilization occurs internally. The eggs are laid in compact, jelly-covered masses that are attached to twigs, plants or sunken logs. Each mass contains 50-160 eggs. The sight of 20 or more large, brilliantly marked salamanders writhing together in as they vie for […]
[…]body, the female scrapes together a pile of rotting leaves and other vegetation, into which the eggs are deposited. Some construct a two-chambered nest, with the upper chamber serving as retreat for the female, while others merely coil on top of the leaf pile. The female guards her 20-60 eggs […]
[…]Setup Snapping turtles are entirely aquatic, rarely bask and usually leave the water only to lay eggs. Hatchlings and small turtles are best kept in water of a depth that allows them to breathe by extending their necks to the surface. They mainly walk about the bottom and are not […]
[…]longer. REPRODUCTION In my experience, most females in NYC and the immediate environs lay their eggs on rainy nights in early June. I am always rewarded by the sight of nesting females on such nights and during the following mornings. If you have a chance to visit nesting sites during […]
[…]to induce egg laying. Odder still, however, was the fact that a male placed in the tank with the eggs (and without the female) on the following day fertilized the eggs. He was in breeding condition, as evidenced by the rough “nuptial pads” along his forearms, and perhaps was responding […]
[…]have quite complicated reproductive behaviors, and exhibit a high level of parental care to their eggs and tadpoles. I will address this topic in a future article. An article with natural history details and information on the care of blue dart frogs in zoos is posted […]
[…]tended by the male, and sometimes by the female as well. Males soak in water and then lie over the eggs to moisten them, and may tend several clutches at once. The eggs hatch in 14-18 days and the tadpoles are transported to streams on the back of either parent. […]
[…]on the Venezuelan llanos. In many different animals, sperm can remain alive and able to fertilize eggs for years to come. Queen termites mate once and somehow produce fertilized eggs for up to 20 years after! Further information concerning research with this species at Wollongong University is available […]
[…]had it been overcome, eventually escaped. Reproduction Mating occurs from March to May, with 6-30 eggs being laid 27-28 days thereafter. Second clutches, laid in August, have been reported in captive situations but not in the wild. The eggs are secreted in cavities below fallen trees and rocks, or within […]
[…]of water. The substrate should be placed within a small Tupperware or similar container and the eggs half-buried into the substrate. Weigh the container, with substrate and eggs inside, and note this figure on the container’s lid. Re-weigh once each week – any drop in weight is the result of […]
[…]male frogs in the wild are being found to have inter-sex characteristics, including immature eggs within the testes. A recent Harvard University study found such characteristics in 21% of the male green frogs, Rana clamitans, in ponds in suburban Connecticut. It seemed that the affected frogs were more common in […]
Spring in the northeastern USA is prime time for amphibian watchers. Its arrival is most noticeably announced by frogs – first by spring peepers, Pseudacris crucifer and wood frogs, Rana (Lithobates) sylvaticus, with a succession of others following close behind. However, the season’s earliest greeters are silent. I have observed […]
[…]beetles, spiders, grasshoppers, caterpillars, mice, shrews, voles, ground nesting birds and their eggs, small snakes, lizards and their eggs, and carrion. Averaging 2-3 feet in length, exceptionally large specimens can top 4 feet. Glass lizards, as their name implies, quickly autotomize (shed) their tails when handled or captured by a […]
[…]with enthusiasm! Male African bullfrogs are diligent parents – they defend the eggs and dig channels to bring water to their tadpoles. You can learn more […]
[…]survive in Madagascar’s forest canopy, reached 24 inches in length. Geckos generally lay 2 eggs, although some bear live young. Arboreal types often glue their eggs to tree branches or building walls. Most are insectivorous, but many take nectar and over-ripe fruits as well. The voracious tokay gecko, Gekko gecko, […]
That Reptile Blog – Reptile, Amphibian and Exotic Pet Care and Information
