Female barn swallows prefer to mate with long-tailed males because these males have genes that confer resistance against parasites. These genes are then inherited by the offspring.

Juvenile sea turtles will attempt to return to their foraging areas if relocated to a different part of the coastline.

Migratory geese have higher survival rates than non-migratory geese during harsh winters.

Changes in hormone concentrations cause young male prairie dogs to disperse from the natal home.