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Biology Factsheet: 306. Avoiding predation 2

  • Biology Factsheet: 306. Avoiding predation 2

Biology Factsheet: 306. Avoiding predation 2

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  • Code: BIA-FSPI-306
  • A cryptic animal is one that is camouflaged in such a way that it is like its environment. This camouflage often involves a close match between the colour of the animal and that of its background. Many studies have been carried out that have been designed to investigate the advantage of crypsis. One involves the snail, Cepea nemoralis. The shell of this snail varies in colour. It may be yellow, pink or brown. The graph in Fig. 1 shows some results from one study. There are two curves on the graph. Curve A shows the percentage of yellow-shelled snails in the wild population on different dates and Curve B shows the percentage of yellow-shelled snails that were eaten by one of their predators, the song thrush.