The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 73
LL F C A common musk turtle Sternotherus odoratus B soft - shell turtle Trionyx snapping turtle Chelydra serpentina ... turtles themselves . In experimental situations they learn to choose among these colours and among various complex ...
LL F C A common musk turtle Sternotherus odoratus B soft - shell turtle Trionyx snapping turtle Chelydra serpentina ... turtles themselves . In experimental situations they learn to choose among these colours and among various complex ...
Page 75
... turtles to lie quietly submerged for hours or even days . The vertebral column , with very little to support , under- went drastic modification . The trend in turtles , in con- trast to that in most other reptiles , has been to reduce ...
... turtles to lie quietly submerged for hours or even days . The vertebral column , with very little to support , under- went drastic modification . The trend in turtles , in con- trast to that in most other reptiles , has been to reduce ...
Page 76
... turtles . Plastron often reduced and in some , singly or doubly hinged . Some exude a disagreeable odour when handled . Pliocene to Recent . Aquat- ic . Widespread in New World temperate and tropical regions . 21 living species , adult ...
... turtles . Plastron often reduced and in some , singly or doubly hinged . Some exude a disagreeable odour when handled . Pliocene to Recent . Aquat- ic . Widespread in New World temperate and tropical regions . 21 living species , adult ...
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