We do not generally expect such apparently dull and stupid creatures as fish and frogs to have any very deep parental feelings, yet we shall see presently that, among the fishes, some are most exemplary parents. And so it is, also, among the much-despised frogs and toads, and some of their near relatives. Indeed, I should have to write a very long chapter if I were to set myself to relate at length every case that is known of this kind. It must suffice to take a few of the more striking instances. But, before I begin, let me ask you to try and recall some of the main facts with regard to the care for the young displayed by the common frog. This animal, you will remember, formed the subject of the first article in this series, wherein it was pointed out that the eggs were laid in huge masses and left to hatch. Beyond seeking out a suitable place for the eggs, no further trouble is taken by the frog, and it is on this account that so many hundreds have to be laid. There must be enough to be eaten by prowling ducks, and enough to hatch into tadpoles, of which, again, there must be enough to be eaten by hungry animals of all sorts, and enough to grow safely into frogs.

This waste of life is, however, avoided when the parents take charge of their eggs, and, in consequence, there is no need to provide so many.

Let us begin with an example or two of nest-building frogs. One of the simplest of these nests is that of a South American frog known as the Ferreiro, or 'Smith,' from the remarkable call which it makes during the spring—a call resembling the sounds made on a smith's anvil. Its nest is made by the little mother of the family alone, who, from the bottom of some shallow pool, scoops out a little basin, using the displaced mud to form a wall or rampart, some four inches high, round the pit, and employing her hands to smooth the inside of the wall, much as a mason uses a trowel. After the nest is ready, she lays therein a few eggs, and then retires with her mate to some secluded spot to watch over her treasures!

Another little group of South American frogs—the 'Phyllomedusa' frogs—lay their eggs to the number of about a hundred, in 'pockets' formed by bringing the edges of a leaf together. Into this 'pocket' the eggs are dropped by the mother; the jelly-like coat with which the eggs are covered serves to hold the pocket together.

Some frogs build 'foam' nests. Thus, a little frog that lives in the West Indies glues her eggs on to a broad leaf, and covers them in a mass of foam. Similarly, the 'banana-frog' of Malacca lays its eggs in a leaf, and surrounds them with a mass of yellow froth (which afterwards becomes steel-grey) as large as a cricket-ball. Herein the eggs develop, until at last the tadpoles emerge and drop into the water below, as in the case of the other frogs who attach their eggs to leaves. A Japanese frog, closely related to the species just described, lays its eggs in a hole in the ground, and then covers them with a mass of froth and air-bubbles formed by working up a sticky slime with its feet until this mass, too, is as large as a cricket-ball!

But many frogs carry their eggs about them. The South American Goeldi's frog carries its eggs on its back, the skin of which on each side is raised up to form a wall holding the eggs in position. A near relative of this species—the pouched frog—has carried this device further, so that the walls meet each other above the eggs, and form a most wonderful pouch. Until lately, it seemed impossible to account for the presence of the eggs in such a strange place, but it is now known that they are placed there by the frog-mother's mate.

In another case—that of a kind of toad which is common on some parts of the Continent—the father of the family winds the eggs in 'chains' around his hind legs, and sits with them, during the heat of the day, in some shady place, emerging with the shade of evening to bathe his growing brood in dew.

A little frog met with in the Seychelles carries its little ones about on its back, much as a duck will carry its ducklings. But the curious Surinam toad of South America has improved on this arrangement, and lodges each little one in a little pocket in the skin of her back!