Because you are stupid
the birds know it by heart
Because the early birds found ways to build nests. Birds know how to build nests so they can survive in this way until today. It is the natural selection.
Some birds do not build nest's .why?
Birds typically build their own nests for shelter, but some species may use abandoned nests from other birds.
Well birds build nests in them.
Birds
in trees
No birds build nests but goats may scrape out an area in the soil to get to the cooler ground.
Their usually sticks.
Birds build nests to protect their eggs.
No, weaver birds typically build individual nests for mating purposes and do not allow other birds to join their nests. Each pair of weaver birds will construct their own nest as part of their elaborate courtship display.
eagles or valtures