Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 PROTECTIVE MOVEMENTS 363 In many situations, however, these color changes may be protective, even though they are not necessarily protective adaptations in all cases. 408. Concealment. Another way in which an animal becomes invis- ible to its enemies is illustrated by the cuttlefish, which ejects a dark fluid into the water when it is pursued. This ' ink-bag ' trick clouds the water and thus enables the animal to escape from its pursuer. Fig. 181. The American
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