Avian clutch size of increasing clutch size with increasing latitude. The proximate and ultimate causes for this pattern have been a subject of intense debate involving the ideas of group and individual selection. David Lack observed a direct relationship between latitude and avian clutch size. Birds near the equator laid approximately half as many eggs as those that resided in northern temperate habitats. He observed an increasing clutch-size from the equator towards the poles (something he referred to as the “latitude trend”) for many passerine (perching) birds, near-passerine (tree-dwelling) birds and in various other groups: Strigiformes, Falconiformes, Ciconiiformes, Laridae, Ralliformes, Galliformes, Podicipedifomes, and
Angry Birds Toons Angry Birds Toons Angry Birds Toons is a Finnish animated TV series based on Rovio's video game franchise of the same name. This animated series follows the adventures of the telekinetic birds that are able to move objects with their minds as they guard their eggs against the telekinetic piggies who want to steal them for their king to eat, as well as adventures from within each group. Episodes have been released weekly. There was an introductory episode called "Meet the Flock" in 17 March 2013, which presented the names of the birds. The green pigs are identified by their