Is bird a mammal?

Birds are not mammals. Mammals are viviparous and can breast-feed their young by secreting milk from the mammary glands, such as pigs, cattle, sheep and so on. Birds are egg-laying animals, mainly laying eggs, and then hatch into young birds.

When do birds lay eggs?

Birds usually lay eggs in spring or summer, then hatch into young birds, and rarely lay eggs in winter. Because the weather is warm and there is plenty of food in spring and summer. Among them, the African ostrich is the largest bird in the world. The egg laid is like a duck egg in color. It is 15-20 cm in diameter and weighs 1400 grams. It is the largest of all bird eggs. The egg shell is so hard that it can bear the weight of a person.

How long will it take for the eggs to hatch?

Different species of birds have different incubation times. If it is a parrot, the incubation period is 28 days, 28 days for ducks, 27 days for storks, 21 days for chickens, such as pigeons, and the incubation period is about 16 days.