Frogs are beginning to spawn in the ditches of southern England. Under the general term frogs which include all the tailless four-legged amphibians. Within the amphibians the frogs have developed in some ways as men have done among the mammals. Our frogs are limited by the fact that their eggs must be laid in water, and they pass their first few months as tadpoles. Several tropical frogs make nests, usually by sticking leaves together, in which a mass of eggs are placed. However the queerest habits of all are those of a Chilean frog, Rhynoderma darwinii. In Rhynoderma the tadpoles swallowed by the males are passed into the croak sacs, which enlarge enormously. One should like to see some of the beautiful tree frogs introduced into warm valleys in Devon and Cornwall, where they would probably do well, and several larger frogs and toads would be a delightful addition to our countryside, provided they did not kill off native animals.