Tool-use research has focused primarily on land-based animals, with less consideration given to aquatic animals and the environmental challenges and conditions they face. Here, we review aquatic tool use and examine the contributing ecological, physiological, cognitive and social factors. Tool use among aquatic animals is rare but taxonomically diverse, occurring in fish, cephalopods, mammals, ...

OSMOTIC REGULATION IN AQUATIC ANIMALS. By August Krogh. Cambridge: At the University Press; New York: The Macmillan Company. 1939, pp. vii + 242, $4.00. To the series of Cambridge Comparative Physiology monographs, Professor Krogh has added a treatise on "the relations between concentrations of solutions, inside and outside cells and organisms." As Professor Krogh points out, there are wide div...

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