Motherhood and the Relationships of the Sexes
Many frogs and toads, both the mothers and the fathers, show a really marked development of the familial instincts.[18] An illustration of this care is furnished by a large tree-frog (_Hyla faber_) of Brazil, commonly known as the _Ferreiro_, “the smith,” from its strange voice resembling the mallet of a smith, slowly and regularly striking on a metal plate.