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
The Tortoise and the Birds is good to eat, whereupon the eagle drops it on a sharp rock and the two birds make a feast of it. This synthetic version and the moral given it, 'Never soar aloft on an enemy's pinions', is often mistaken as authentic nowadays. The Tortoise and the Birds The Tortoise and the Birds is a fable of probable folk origin, early versions of which are found in both India and Greece. There are also African variants. The moral lessons to be learned from these differ and depend on the context in which they are told. A tale concerning a talkative