ECOLOGY
ORGANISMS AND THE ENVIRONMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Birds use twigs to build a nest.
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Birds hatch eggs and feed their young.
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Birds breathe air and drink water.
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Birds find food.
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Detailed explanation-1: -Birds construct many different types of nests. There are floating nests, cups, domes, pendulums and basket-shaped nests. They can be made out of sticks, twigs, leaves, grasses, mosses or even mud.
Detailed explanation-2: -Instinct/instinctual behaviours need not be learned or practiced. These kind of behaviours are present by birth. Making nest by birds, web spinning by spider, etc., are examples of instinctual behaviour of animals.
Detailed explanation-3: -For some species, a nest is simply a shallow depression made in sand; for others, it is the knot-hole left by a broken branch, a burrow dug into the ground, a chamber drilled into a tree, an enormous rotting pile of vegetation and earth, a shelf made of dried saliva or a mud dome with an entrance tunnel.
Detailed explanation-4: -Nest building is one of the most important activities of birds as the nest not only provides shelter and protection from predators to the birds but also plays an important role in brooding i. egg laying and raising their young ones.