Birds of Zion National Park

The Snowy Egret (Egretta thula) is a small white heron. It is the American counterpart to the very similar Old World Little Egret, which has established a foothold in the Bahamas.
The juvenile looks similar to the adult, but the base of the bill is paler, and a green or yellow line runs down the back of the legs. The species usually occurs in loose groups and roosts usually communally.
In summer, Snowy Egrets nest in colonies, called ‘rookeries,’ in trees surrounding lakes and ponds. This species utilizes similar habitats during the winter. Snowy Egrets mainly eat fish, but may also take crustaceans and small vertebrates (such as frogs, lizards, and mice) when the opportunity arises. Snowy Egrets may be best observed wading in shallow water, where they may be seen plunging their bills into the water to catch fish. It is also possible to see Snowy Egrets at their rookeries, especially when they return to roost at sunset, or while flying with their feet extended and their necks pulled in. Snowy Egrets are primarily active during the day.
Their breeding habitat is large inland and coastal wetlands from the lower Great Lakes and southwestern United States to South America. The breeding range in eastern North America extends along the Atlantic and Gulf Coasts from Maine to Texas, and inland along major rivers and lakes. They nest in colonies, often with other waders, usually on platforms of sticks in trees or shrubs. Their flat, shallow nests are made of sticks and lined with fine twigs and rushes. Three to four greenish-blue, oval eggs are incubated by both adults. The young leave the nest in 20 to 25 days and hop about on branches near the nest before finally departing.
Egretta thula communicates through sound vocalizations and posture. Young birds produce soft, buzzing calls and mature birds produce high and low-pitched calls. High-pitched calls signify plentiful foraging sites and low-pitched calls signify aggressive situations. Greeting calls are common among egrets. Only males tend to use high sound vocalizations, especially to attract a female mate. Communication sounds are also used to defend the territory surrounding the nest. An egret's upright posture with fully erect feathers marks the onset of an attack on another bird. less ↑

The American Bittern (Botaurus lentiginosus) is a wading bird of the heron family Ardeidae.
Although common in much of its range, the American Bittern is usually well-hidden in bogs, marshes and wet meadows. Usually solitary, it walks stealthily among cattails or bulrushes. If it senses that it has been seen, the American Bittern becomes motionless, with its bill pointed upward, causing it to blend into the reeds. It is most active at dusk. More often heard than seen, this bittern has a call that resembles a congested pump.
The long, thick bill enables the taking of a variety of large and small prey (Kushlan 1978), a conclusion supported by analyses of stomach contents. Based on 160 specimens (133 with food remains) collected throughout North America, stomach contents included insects (23%, including many Odonates), frogs and salamanders (21%), fish (21%, including catfish, sunfish, yellow perch, suckers, killifishes, and sticklebacks), crayfish (19%), mice and shrews (10%), snakes (5%), and small quantities of crabs, spiders, and unidentified invertebrates (Cottam and Uhler 1945). Nine stomachs from Pennsylvania contained fish, frogs, crayfish, watersnakes, snails, beetles, and grasshoppers (Warren 1890). Have been observed intercepting dragonflies in midair (Dudones 1983).
Many of the folk names[citation needed] are given for its distinctive call made by inhaling and exhaling large quantities of air; E. Choate[7] lists "Bogbumper" and "Stake Driver". Pliny likened the old-world bittern's call to the roaring of a bull, "boatum tauri", whence the generic name Botaurus
The American Bittern (Botaurus lentiginosus) is protected under the United States Migratory Bird Treaty Act of 1918. [1] It is also protected under the Canadian Migratory Birds Convention Act of 1994. less ↑