Black-throated Blue Warbler. Dendroica caerulescens . Nesting Ecology. Not all bird species build nests. Egg laid by a Fairy Tern. Adult Fairy Tern and egg. What is a Nest?. A nest is a structure made by birds to hold eggs.
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Egg laid by a Fairy Tern
Adult Fairy Tern and egg
A nest is a structure made by birds to hold eggs
They are usually "scrapes" in a depression in the ground. The bird shapes the scrape with her abdomen by rotating in the same place many times.
Ground nests were likely the first nests made by birdsTypes of Nests
-Essentially they are flat areas with a slight depression to hold the eggs.
Many species, such as this osprey nesting in an abandoned granite quarry, are quite adaptable and readily use man-made structures for nest substrates.
White stork nest in Central Europe
Can you name this bird, nestingon a man-made platform?
Can you name this bird, nestingon a man-made platform in the Eastern Deciduous Forest?
Does this help?
Warbling Vireo NestTypes of Cupped Nests
Black-capped Vireo Nest
Nest of unknown vireo species(post fledging)
Pendulous - suspended by their rims and have flexible woven sides. The deeply cupped part of the nest swings freely
Baltimore Oriole Nest
Crested OropendolaTrinidad and Tobago
Montezuma’s OropendolaCosta Rica
Barn Swallow Nest
Cliff Swallow Nests
Domed mud nest
Gopher Snake Raids Swallows' Nests
Many experiments have shown that nests in small woodlots receive more predation than those in large contiguous woodlots
Some do both
Similar, but not closely related to North American finches
Most species are colonial nesters and flocking foragers
Some species are territorial, nesting in pairs and foraging singly
Food seems to be the reason for differencesAn example with Weaver Birds (Passeriformes; Ploceidae)
Feed on fish and crustaceans by diving in open water
hard to protect feeding territory
Nest in burrows at tops of cliffs or on islands
inaccessible to mammalian predators, but are preyed upon by Black-backed GullsAn example with Atlantic Puffins (Charadriiformes; Alcidae)
Feeds primarily on fish, but will take insects and other arthropodsAn example with Great Egrets (Ciconiiformes; Ardeidae) in the Everglades
Nests densely packed in vegetation 0.5 m or higher above ground/water
Single historic colonies may have contained as many as 750,000 breeding pairs
Usually 20,000 or fewer pairs breed in entire Everglades system at presentAn example with Great Egrets (Ciconiiformes; Ardeidae) in the Everglades
L-67 breeding colony in the
Inaccessible for most mammalian predators, although some colonies may support small raccoon populations
Black-crowned Night Herons take nestlings
Boat-tailed Grackles, Crows take eggsAn example with Great Egrets (Ciconiiformes; Ardeidae) in the Everglades
Selfish Herd Concept
Information Center Hypothesis
Must satisfy all six conditions to support ICH; Most studies only demonstrate a couple