The Social Life of Animals |
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adapted aggregations animal kingdom ants apparently aquarium Arbacia bacteria become behavior biological biologist birds breeding castes cent chance chickens cockroaches colloidal silver colony contacts cooperation crowding Daphnia Dionne quintuplets divided aquarium dominance dowitchers eel grass effect of numbers eggs evidence evolution existence experimental experiments fact factors favorable feeding females flock frequently gene frequencies given goldfish grow growth heath hen herd heredity human increase individual insects intermediate isolated isopods laboratory larger laughing gulls less living males mating maze mice mutation nations nest numbers present nymphs observed organization Oxytricha pairs peck order placed planarian population population density possible Professor protozoans RADIATED rapidly reaction relatively reproduction selection sexual similar SINGLY snails social facilitation social hierarchy social order species sperm spermatozoa square mile subsocial survival value tends termites tion truly social usually Welty workers worms