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
Birds Eye View The most common touring programmes include screenings of silent films with new live scores by female musicians, which BEV regularly commissions as part of its Sound & Silents programme. The Festival also takes special events to the Edinburgh and Cannes international film festivals. The Birds Eye View Awards are presented annually to the best feature, documentary and short films screened at the Festival, as selected by juries of leading industry figures and film critics. Birds Eye View's training programmes are called the BEV Labs, made up of specialised intensive training programmes designed to develop new female filmmaker talent and bring