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
Killing Birds Killing Birds Killing Birds is a 1988 Italian horror film filmed in Louisiana and starring Lara Wendel and Robert Vaughn. It was co-produced by "Flora Film" and Joe D'Amato's "Filmirage". The director's credit reads "Claude Milliken", which is the pseudonym of Claudio Lattanzi, but according to most accounts, the film was completely or almost completely directed by Joe D'Amato in Lattanzi's presence. Theatrically, the film was released in Italy as "Killing Birds" in 1988 and in France as "L'attaque des morts-vivants". On home video, it was released in Italy and Germany as Killing Birds: Raptors and in the United States