By John Montroll
25 origami initiatives contain a duck, swan, bald eagle, bighorn sheep, armadillo, bison, musk ox, deer, and plenty of different wild denizens of North American lands.
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Additional resources for North American Animals in Origami
In a large group, males compete with each other for mating rights and hence large male body size has been selected for. Crook and Gartlan's approach was to categorize the primates into a small number of discrete groups. This raises two main problems. First of all, variation in features such as home range size and group size is continuous and so division into hard and fast groups is a bit arbitrary. Because the groups are subjectively defined, it is difficult for subsequent workers to categorize new species in the scheme.
For example, De Vore (1965)noticed that, compared with other species of primates, anubis baboons live in large groups, the males are large and they have big teeth. He suggested these may all be adaptations to predator defence in a terrestrial environment. By 1966, there were sufficient field data for Tohn Crook and Stephen Gartlan to apply the first comparative approach to a large number of primates. Like the weaver bird and antelope work, they categorized the species into several groups based on ecology and behaviour.
7 A black-headed gull removing an eggshell from its nest. Photo by N. Tinbergen. down has dried out and become fluffy it is much harder for a gull to swallow, and is therefore less vulnerable to attacks from neighbours. The parent's delay before removing the shell therefore probably reflects a balance between the benefits of maintaining the camouflage of the brood and the costs associated with leaving a newly hatched chick at its most vulnerable moment. When the balance between costs and benefits is changed, the length of the parent's delay might also be expected to change.