When most of us think of the canary, we think of a cheerful, bright yellow bird in a decorative cage. In reality, this common canary (Serinus canaria domestica) is the domesticated cousin of the “true” Island Canary (Serinus canaria), native to the Canary Islands just off the northwest coast of Africa.

Spanish sailors first brought the canary to Europe in 1478, where it was prized among those wealthy enough to afford one for the male canary’s silvery, twittering song. The brilliant yellow color that we associate with modern domestic canaries is the result of a genetic mutation that suppresses the melanin in the birds’ feathers, effectively “erasing” the dark banding and streaking found on wild birds. For the next century, the Spaniards controlled availability of canaries by only selling male birds to the rest of Europe. When a shipping accident in the 16th Century allowed a shipment of the birds to escape to Elba Island in the Tuscan Archipelago, the Italians were quick to take advantage of the situation. Soon canaries were being bred and sold all over the world outside of Spanish control.

The ready availability of domestic canaries made them ideal candidates when, in the late 1890’s, pioneering physiologist John Scott Haldane recommended the use of small, warm-blooded animals as “sentinels” for the build-up of toxic gases in coal mines. A build-up of toxic gases following “firedamp” and coal dust explosions was known to be what killed most miners, but reliable gas detectors were hard to come by. The flame of a “safety lamp” could be used to detect rising levels of methane and “chokedamp” (a combination of gaseous nitrogen and carbon dioxide), but no mechanical means of measuring carbon monoxide existed. With their small body size and faster metabolism, animals such as mice and canaries would succumb to a build-up of carbon monoxide more quickly than a human. Canaries came to be preferred over mice because the birds more visibly demonstrated signs of distress in the presence of even small quantities of carbon monoxide gas. This few minutes of warning gave miners time to put on protective gas masks, or even to leave the mines entirely. In their capacity as sentinels, canaries saved the lives of thousands of miners during the nearly 100 years they were in use. Today, we still use the phrase “the canary in a coal mine” when we talk about species who are biological indicators for the health of an ecosystem – species who, like the canary for the miners, begin to suffer and die as an early sign that something is wrong. Changes in the function, health, or population of these indicator species can reveal such things as the accumulation of pollutants (lamp shell brachiopods), changes in overall air quality (milkweed and some strains of white pine are sensitive to ozone), and the threat of rising ocean temperatures (corals and marine fishes worldwide).

One of the most familiar tanagers of the Neotropics, the Blue-grey Tanager ranges from Mexico south through Central and South America. This species uses a wide variety of non-forest and human-altered habitats, including cacao and coffee plantations, city parks and gardens, and second growth forest and forest edges. Typically seen in pairs, this tanager may join mixed-species flocks while foraging on arthropods and fruit. The nest is a deep cup of rootlets, moss, grass, and other materials, sometimes constructed of materials taken from other tanagers, euphonias, and flycatchers. The Blue-grey Tanager is widespread and abundant, and is not considered threatened.

This spectacular bird, with its bright orange fan-shaped crest, is a resident of montane cloud forests, especially in ravines and along streams, in the Andes Mountains from Venezuela to Bolivia. The Andean Cock-of-the-rock feeds on fruits, large insects, and small vertebrates, and builds a nest mainly of mud lined with coarse vegetable fibers and attached to a rock face. This is a lekking species, with males performing elaborate ritual displays at a communal site where the females determine the winner. Males display in pairs, with each male perched 4–6 meters above the ground. Each bird performs ritualized bowing and head-bobbing displays towards the other, with much jumping, wing-flapping, bill-snapping, and calling; displaying intensifies when females approach. The Andean Cock-of-the-rock is not globally threatened, but it is very localized in its distribution.

Rainbow Lorikeets couldn’t have a more appropriate name. These small, active parrots are among the most brightly colored in the bird world – as though someone used a whole box of crayons while designing them! Lorikeets are native to Australia and eastern Indonesia, where they live in large, noisy flocks. Nectar from blooming trees such as the eucalyptus, African Tulip-tree and cheesewood is an important food source for lorikeets. As a result, lorikeets are an important pollinator for these and other trees. Lorikeets will also eat figs, apples, and sorghum, and sometimes papaya and mango fruits which have already had their tough skins opened by fruit bats. Because of this, they are sometimes considered a crop pest by farmers with orchards.

The National Aviary is home to two of the many subspecies of Rainbow Lorikeet: the Swainson’s (Trichoglossus haematodus moluccanus) and the Edward’s (T. haematodus capistratus). The Swainson’s Rainbow Lorikeet (native to Eastern Australia and Tasmania) is mostly green, but with a deep blue head, a yellowish collar, and a red chest. The Edward’s (native to the Lesser Sunda Islands north of Australia) is almost a faded version of the Swainson’s, with a head gently shaded by blue and a striking yellow front.  In fact, some sources argue for renaming the Edward’s Rainbow Lorikeet the Marigold Lorikeet and making it a separate species.

Scarlet Macaws are a striking bird, known for their deep red coloring and white faces. In their tropical evergreen habitats, they can often be seen flying in pairs or in family groups. Their calls can be loud and harsh, and Scarlet Macaws in human care can sometimes mimic human speech. They have powerful beaks and strong feet built for grasping. While not globally threatened, habitat loss and trapping for the illegal wildlife trade are concerns for this species.

The Palm Cockatoo has the largest bill of any parrot (except for the Hyacinth Macaw), and it uses its powerful bill to eat very hard seeds and nuts that other species can’t access, like palm nuts. They are also among the loudest of all parrots, and communicate by whistling contact calls, stomping noisily on their perches, and drumming loudly against trees with a stick. This drumming display can be used to signify their territory to other Palm Cockatoos, but is also performed at the nest site as a courtship display! Before breeding season begins, a pair of Palm Cockatoos may construct multiple nests. Some are used exclusively for display purposes.

The Meyer’s Parrot (also called the Brown Parrot), is a species native to tropical Africa, found throughout scrub, savanna, palm grove, and subtropical woodland habitats. This species relies on old-growth areas with large trees, because it nests in the excavated cavities left by woodpeckers. While the Meyer’s Parrot is similar to other parrots in its diet of fruit and seeds, it has also been observed eating the flowers of some trees and shrubs. This parrot is considered an agricultural pest because of the damage it can do to ripening food crops. Meyer’s Parrot populations are stable, given their large population and their wide range.

The Green-winged Macaw (also called the Red-and-green Macaw) is a large parrot, second only to the Hyacinth Macaw in size. This species range is also large, spanning eastern Panama to Paraguay. The Green-winged Macaw’s band of green feathers on its wings and the presence of fine, tiny red feathers on its white face distinguish it from the similar Scarlet Macaw. It has an extremely powerful bill, which it uses to easily crack open hard-shelled nuts like Brazil nuts. Unlike many parrot species, Green-winged Macaws are not great imitators. Although not globally threatened, the Green-winged Macaw is generally uncommon, with pairs frequently solitary and dispersed. This species has a shrinking range, with population declines at the edges of its range.

Adult Spectacled Owls are distinctive for their brown upperparts and head with whitish face markings resembling a pair of glasses. As juveniles, their facial markings are the complete opposite—pure white except for a chocolate brown facial disc! This distinctive species can be found throughout Central and South America in dense rainforest habitats. The call of the Spectacled Owl is a quick series of popping sounds, which sound like someone knocking on a door. Males sing more often than females, usually to claim territory, but have been known to sing duets together.

Eurasian Eagle-Owls have the largest wingspan of any owl species, reaching a whopping 6.5 feet! This species is widely distributed across Europe and Asia, and frequents a variety of habitats, from coniferous forests to grasslands and deserts. Eurasian Eagle-Owls are powerful flyers and soar on updrafts, similar to the flight style of many hawks. They are considered an apex predator, and have no natural predators, and they use a variety of hunting techniques to obtain prey. They are not picky eaters, and will eat anything from small mammals like voles to snakes and lizards, and occasionally even other birds of prey.

Eastern Screech-Owls are a very common owl species throughout North America, and they have gotten very used to living near humans. These pint-sized owls can be gray or a reddish-brown. They roost and nest in cavities in trees, but also make use of nest boxes. Males are smaller than females, but still have a deeper voice.

Burrowing Owls are a small, long-legged species of owl that spends the majority of its time on the ground. They are native to open grassland, prairie, and desert habitats and range from southern Canada (where they are considered an endangered species) to the drier habitats of South America. They have also been found nesting in man-made structures and in close proximity with people on golf courses, campuses, and suburbs. Burrowing Owls differ from most owls in a variety of ways. They are primarily terrestrial and nest underground, while the majority of owls are cavity nesters or use the nests of other birds, such as crows or hawks.  This owl’s habit of nesting in colonies in underground burrows across flat, treeless habitats has put it in competition with many kinds of human development, such as agriculture, housing plans, golf courses, and airports. As a result, programs exist to safely translocate Burrowing Owls and to attract them to nearby protected sites using artificial burrows.

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