That Bird Blog – Bird Care and History for Pet Birds

Recent research on avian vision at Sweden’s Lund University has revealed that birds lose their ability to see color at twilight.  These findings have inspired me to consider how we might use lighting in order to improve the health and breeding potential of captive parrots, finches, doves and other birds.

The Findings

The article, published in the Journal of Experimental Biology, points out that birds need 5-20 times the amount of light as do humans in order to see color.  By day, birds have extremely sharp color vision, and see both UVB light and a far greater range of colors than do people.  However, their color vision disappears at twilight – far earlier in the day than does that of any other animal studied thus far.

Light’s Effect on Captive Birds

I believe it is important that we consider the type of light we provide to our birds…the zoos in which I have worked are now experimenting with full spectrum lighting in their bird exhibits.

Poor light quality and intensity may explain the difficulties experienced in breeding otherwise hardy bird species in captivity.  Light can have some unexpected implications for reproduction.  Captive female desert iguanas (lizards native to Southwestern North America), for example, rarely reproduce unless given full-spectrum lighting…without UVB light, they cannot see the pheromone trails laid down by males.

Similar scenarios are likely at work where birds are concerned.  Indeed, there are indications that proper levels of UVA and UVB light encourage natural behaviors, reproduction and strong immune systems in captive birds.

Providing Birds with Appropriate Light

Fortunately, a number of options are open to bird owners.  Exposure to natural sunlight (bearing in mind that glass and plastic filter out UVB rays) is the best of these, but when this is not possible a high quality Full Spectrum Bird Lamp should be utilized.

Further Reading

The new findings on light intensity should be valuable in explaining certain aspects of bird evolution and behavior.  For example, the chicks of Gouldian, firetail and zebra finches, all of which nest in dark tree hollows, sport light-reflecting nodules near their mouths.  To read more about this survival strategy, please see my article Flashy Finch Chicks.

Most aviculturists are aware that most parrot species face threats to their continued survival in the wild.  However, I sometimes feel that the successes that we have had both in and out of captivity blinds us to the fact that a great many, including several that are well-established in the pet trade, are still declining in the wild.

Parrot Central

The region extending from New Zealand northwest through Australia to New Guinea and the islands of Indonesia is home to the world’s greatest diversity of parrots, with over one half of the known genera represented.  Conservation efforts are most effective in Australia and New Zealand, but less in evidence in New Guinea and islands in the Southwest Pacific.

Threatened Species

Of the many parrot species in need of attention in the area, the World Conservation Union (IUCN) considers 20 to be threatened with.  Particularly troublesome is the fact that almost half of these are listed as either “Endangered” or Critically Endangered”, including the New Caledonian, Kuhl’s and Ultramarine Lorikeets, the Night, Orange-bellied and Golden-shouldered Parrots, the Forbes’ and Orange-fronted Parakeets and the Kakapo.

Australia

Habitat Loss

Habitat loss and alteration is the gravest threats facing Australia’s parrots.  The felling of old trees bearing suitable hollows for nesting is particularly serious, as many parrots have specific requirements as to the size, height and location of nesting hollows, and will not utilize alternatives.  Especially hard hit have been Baudin’s, Carnaby’s and Mitchell’s Cockatoos, but most others are affected as well.

The loss of unique feeding habitats, especially lightly wooded grasslands, has severely impacted superb and swift parrot numbers.  These fertile areas are scarce in Australia, and most have long been converted to agricultural use.

The spread of agriculture and the introduction of exotic plants has benefitted those parrots that have been able to adapt to new diets.  Included among these are Galahs, Long-billed Corellas and Turquoise Parakeets.  However, these species are thriving at the expense of others, and their unnaturally high numbers radically upset the normal species compositions of their habitats.

Livestock and Kangaroos

Centuries of intensive grazing by introduced domestic and feral animals such as rabbits, cattle, sheep, goats and camels has rendered natural plant and tree re-growth impossible in many regions.  Populations of native kangaroos have skyrocketed in those places where permanent water holes have been established for livestock, adding to the overgrazing problem.

Fire

Certain parrots rely upon fire to spur the reproduction of food plants, while others inhabit stable environments that rarely experience natural fires.  Human engineered fire use – burning off brush in some habitats while suppressing natural fires in others, threatens parrots in both categories.  Night, Princess, Golden-shouldered and Orange-bellied Parrots have declined radically due to changes in fire frequency.

Islands of the Southwest Pacific

While logging is a grave concern on the Solomon Islands and elsewhere, introduced predators account for the greatest losses in this region.  Five parrot species on New Zealand alone owe their threatened status to non-native predators such as Brush-tailed Possums, cats, black and Norway Rats, ferrets and stoats.

It often surprises those unfamiliar with the region that hunting is still a concern in New Guinea.  The highly endangered palm cockatoo is a much valued food item in some areas, and Pesquet’s Parrots are frequently killed for their plumage.

Further Reading

You can learn what the IUCN is doing to help conserve parrots in the Southwest Pacific here.

Kakapo image referenced from wikipedia and originally posted by Mnolf
Cockatoo image referenced from wikipedia and originally posted by Snowmanradio

Aviculturists in the USA are sometimes surprised to learn that one of the world’s most splendidly-colored birds is a native, and is well established in captivity in other countries.  The male Painted Bunting (Passerina ciris), clad in bright blue, vermillion, red, orange and green, rivals any tropical species in beauty.

Range and Status

Two distinct populations of Painted Buntings range from North Carolina south through Florida to Cuba and other Caribbean islands and from northern Texas to Mexico.

Protected from capture in the USA, poaching is believed to be a threat to their survival in Mexico.  The Audubon Society has documented severe declines in the eastern population as well.

It is not legal to keep painted buntings in the USA, but hands-on work with them is sometimes possible for licensed rehabilitators (please see “Further Reading”, below).  These gorgeous relatives of the northern cardinal have, however, long been a favorite in European collections and, to a lesser extent, among Mexican aviculturists.

Husbandry

Painted Buntings are not particularly delicate captives, but are best kept in an outdoor aviary rather than a cage.  When provided with a warm shelter, they can overwinter outdoors in as far north as England.

Wild Painting Buntings consume a diet composed nearly equally of insects and other invertebrates and seeds, grains, buds and shoots.  Interestingly, they have often been observed to pluck insects from the webs of the huge orb-weaving spiders (Nephila spp.) that occur over much of their range. While captives survive on a seed based diet, variety is required if they are to remain in peak condition.

Maintaining Color

The plumage of male Painted Buntings typically fades in captivity.  The most brilliantly colored specimens that I have seen in zoos have been fed a diet rich in live insects, including wild caught species. The provision of natural sunlight or the use of a UVA-emitting lamp may also help to maintain the colors of the feathers.

Captive Breeding

Painted Buntings are not “easy” breeders, but a compatible pair that does reproduce will usually be quite consistent.  Males are absolutely intolerant of each other – fights between free-living individuals occasionally result in fatalities.

A large, well-planted aviary situated in a quiet location is common to all successful breeders, and a steady supply of live or canned insects is necessary if the young are to be reared successfully.

Further Reading

Although Painted Buntings may not be kept as pets in the USA, people licensed to rehabilitate birds do occasionally have a chance to work with them.  The National Association of Wildlife Rehabilitators offers advice to those wishing to become trained and licensed as rehabilitators.

Painted Buntings are in decline, and your observations can be of use in helping to conserve them.  Please visit Ebird to learn more and report sightings.

Next time we’ll take a look at some of this bird’s equally colorful relatives.

Painted Bunting (male) image referenced from wikipedia and originally posted by Doug Janson

Please see Part I of this article for information on feeding winter residents, hummingbirds, and other summer visitors.  Today we’ll take a look at bird baths, birding opportunities and luring bats and other small mammals.

Birding Opportunities

Warm weather bird-feeding usually results in spectacular bird watching opportunities…driven to catch hundreds of insects daily, raise several broods and keep themselves fed as well, parent birds are far less cautious than at other times of the year.

Give our Audubon Bird Call Whistle  a try.  My first, received from my grandfather nearly half a decade ago, drew the attention of nearly every furred and feathered visitor to my childhood feeders.  The Backyard Bird Tracker  will help you to identify the birds you see and provides interesting life history details and a place for recording your observations.

Other Steps You Can Take

Setting out bird baths within easy reach of your feeders will increase visitation, including by bird species that might not be interested in the foods you provide.  For example, robins, which in most areas are earthworm specialists, will readily make use of bird baths.

A well-thought out garden (please see below) will encourage reluctant feeder-visitors to remain and forage upon insects, buds and other treats.

Mammals: Flying Squirrels, Gray Squirrels and Bats

Don’t forget your mammalian friends.  Gray squirrels newly emerged from the nest are clumsy and even more entertaining than are adults.  By providing squirrel feeders, corn logs  and peanuts, you can limit competition with avian visitors and provide yourself with quite a show.

If flying squirrels are resident in your area, by all means install some indirect lighting and take a look at your feeders after dark.  These adorable, nocturnal acrobats are quite fearless feeder users…trust me, you will not regret the effort.  Resident even in the heart of NYC, flying squirrels do not reveal themselves in the daytime.  A call to your local zoo or nature center should provide you with information concerning local populations.

While we’re on nocturnal mammals, let me not forget some of my favorites, the bats.  I have rehabilitated a number of injured bats, and never tire of watching their nighttime hunting forays.  A surprising variety of species inhabits the USA, even within most cities…try putting up a bat house and see what happens.

Further Reading

For information on planting a garden that will both attract wild visitors and provide nutritious food for your pets, please see my article Gardening for Birds.

A unique video showing northern flying squirrels using a backyard feeder is posted at:

http://www.youtube.com/watch?v=ZHuzmNBTquw

Oriole Image referenced from Wikipedia and originally posted by Badjoby.

Dendroica petechia image referenced from Wikipedia and originally posted by Mdf.  

Last time we took a look at the unusual nesting behavior of this popular little parrot (please see The Half Moon, Orange-Fronted or Petz’s Conure and its Relationship with the Arboreal Black-Headed Termite.) But, as if breeding in termite mounds were not enough to distinguish it from other parrots, the half moon conure also changes the usual parrot “roosting rules” as well. And with good reason…

Giant Bats and Conures…Avoiding a Nightmarish Predator
The half moon conure exhibits a few odd behaviors as regards predator avoidance. Researchers in Guancastle, Costa Rica, have noted that resident half moon conures change roosting sites nightly. It seems that they are the favored prey of a truly unique predator, the huge false vampire bat, Vampyrum spectrum (I’d certainly move around allot if it helped to outwit a giant, flesh-eating bat!).

False vampires are spectacular and unusual bats. Although I have yet to see one in the wild, I was shown a roosting hollow in Costa Rica (they roost singly or in small groups, unlike most bats). The floor below the tree cavity in which the beast spent the day was littered with parrot feathers and the skulls of rodents, frogs and other bats.

A Quiet Group of Parrots?
Another unusual half moon trait is their habit of becoming very quiet upon first sighting a predator. The quiet – rather than, as with most parrots, the noise – spreads to adjacent groups of conures very quickly. If the predator advances, the conures begin to scream in true parrot fashion and fly off.

Further Reading
A false vampire bat may have been an incident involving a parrot that I came to know while working in Costa Rica. Please see my article Parrots and the Perils of the Tropical Night.

The following article contains a wealth of information on false vampire bats in the wild and captivity. Bats are not birds…but this one is well-worth reading about!
http://www.science.smith.edu/departments/Biology/VHAYSSEN/msi/pdf/i0076-3519-184-01-0001.pdf

Photo courtesy of Wikipedia Commons.