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
As Birds Bring Forth the Sun and Other Stories As Birds Bring Forth the Sun and Other Stories As Birds Bring Forth the Sun and Other Stories is a collection of short stories by Canadian author Alistair MacLeod set predominantly in Cape Breton Island, Nova Scotia and in Newfoundland. It was originally published in 1986. All of its stories were later republished in "Island". Macleod explores how family stories and myths, even though they are fictitious, fold into the present to provide comfort in times of emotional distress. The narrator retells the family history of an ancestor who saves and nurtures back to health an injured puppy on the