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Beginnings of Cooperation
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adapted aggregations animal kingdom ants aquarium Arbacia bacteria behavior biological biologist birds breeding caste cent chickens cockroaches colloidal silver colony conditioned water contacts cooperation Crepidula crowding Daphnia Dionne quintuplets divided aquarium dominance dowitchers eel grass effect of numbers eggs evidence evolution existence experimental experiments fact factors favorable feeding females Figure fish flock frequently gene frequencies given goldfish grow growth heath hen 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 parakeets peck order placed planarian population population density possible Professor protozoans RADIATED rapidly reaction relatively reproduction selection sexual shown similar social facilitation social hierarchy social order species sperm spermatozoa square mile subsocial survival value termites tion trained truly social usually Welty worms Zool