Mating by birds — the passage of sperm from the male to fertilize eggs produced by the female — is quite unlike that of mammals. It begins with the male Tree Swallow, in this case, finding an ...

An old saying goes, “One swallow doesn’t make a summer.” Fortunately, we don’t have to settle for just one species. During the summer, members of the swallow bird family are common all over North ...

Cliff swallows are said by ornithologists to show the highest degree of colonization of any of the 89 swallow species in the world. Colonies can number from 200 to more than 2,000 nests. They could be ...

Female birds sing. That is one conclusion of our 2020 study on one of the most abundant, widespread, well-studied bird species in the world: the barn swallow. Despite the well over 1,000 scientific ...