They prey upon every kind of arboreal animal - birds, tree-frogs, tree-lizards, &c. All seem to be diurnal, and the larger kinds attain to a length of about 4 ft.
This thought begins to appear in literature in the end of the 5th century B.C., when Aristophanes (Frogs, 186) speaks of the plain of Lethe.
Mice, rats, water-rats and moles, as well as frogs, constitute its principal food.
It may also be noticed that in mammals and birds which hop on two legs, such as jerboas, kangaroos, thrushes and finches, the proportionate length of the thigh-bone or femur to the tibia and foot (metatarsus and toes) is constant, being 2 to 5; in animals, on the other hand, such as hares, horses and frogs, which use all four feet, the corresponding lengths are 4 to 7.
So far as these are an article of general commerce, they come, like frogs, terrapin and turtles, mainly from the counties of the embayment region.