Some birds put the eggs inside or on top of the mound of leaves and twigs. The Jackdaw of Altenberg[ change change source ] Konrad Lorenz noticed that when birds sing, they often use a lot of their regular calls as part of the song.
Lorenz was sure that it was her long-lost "husband" who had found his way home at last.
There are more than species of birds. Certain birds are kept near coal mines for the prediction of the mine explosion, as the birds are sensitive to the release of high levels of carbon monoxide beyond permitted limits and begin to die. Danger cries are different from territorial songs, and mating calls are a third type.
They are an integral part of our ecosystem and should be protected.
They are considered as the king of all the birds. Some birds can sing, and they are called songbirds or passerines. It is the same reaction as that which keeps mammals and birds at a high temperature.