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able adult Ainsworth altricial animals attachment Authors Guild babies baboon behavior beluga biologists birds bluebirds bottle Bowlby breast feeding breast milk brood parasites caregivers chicks child cliff swallows clutch crop milk cuckoo daughters dunnocks eastern bluebird emperor penguins ents environment evolved fants fathers feed their young female's fertilized fish forage genes genetic give birth Gusii Harlow hatching hornbill human infant human mothers incubate their eggs insects inside lactation lamb leave less live look male lactation males and females mammalian mammals mammary glands mate maternal monkeys monogamous natural selection nest nestlings newborn observed offspring pair parents penguins percent precocial predators pregnancy primates produce protection pups raise recognize reproductive success researchers Robert Trivers seals sheep smell social species studies survival teats tend tion trees Trivers viviparity wasps weaned wet nurses women
Tmecca : A Natural History of Parenting: A Naturalist Looks at ...
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