Photos of Eggs That Show How Different Birds Build Their Homes

• Mallard ducks use their own feathers to insulate their nests.
• Hummingbirds lay small, white eggs approximately the size of jelly beans.
• Swiftlets build nests out of their saliva on cave walls and cliff sides.
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There are as many as 18,000 species of birds in the world with varying nesting habits. Some build their nests in the tops of trees, while others nest on the ground. Some build their homes alone, and others build nests with a mate as part of the courtship process. Some birds lay colorful or speckled eggs, and others lay eggs with plain white shells.

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