Waterfowl like this Muscovy duckling spend up to 30 days in the egg, so they’re able to walk, swim, and feed themselves as soon as they hatch. We call these chicks precocial. By contrast, the chicks of most songbirds spend less time maturing in the egg. They must continue to develop in the nest before heading out on their own. We call these hatchlings altricial since they depend on their parents to care for them.

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