And last but not least, when we look upon the whole animal creation as the result of the long working out of nature’s laws as laid down from the first by the Great Power of the Universe, what new pleasure we find in every sign of intelligence, affection, and devotion in the lower creatures! For these show that the difficulties and dangers of animal life have not only led to wonderfully-formed bodies, but also to higher and more sensitive natures; and that intelligence and love are often as useful weapons in fighting the battle of life as brute force and ferocity. Even among the fish, which, as a rule, drop their eggs and leave them to their fate, we have exceptions in the nest-building sticklebacks and the snake-headed fish of Asia, which watch over and defend their fry till they are strong, in the pipe-fish where the fathers carry the young in a pouch, and in sharks which travel in pairs; while a pike has been known to watch for days at the spot where his mate was caught and taken away, and mackerel and herrings live in shoals and probably call to each other across the sea. Among the other cold-blooded animals--the frogs, newts, and reptiles--it is true we find less show of feeling, but we must remember that these are only poor remaining fragments of large groups which have disappeared from the earth. Even among the amphibia however a tame toad will become attached to one person; while among reptiles, lizards are full of intelligence and affection, and snakes are well-known for their fondness for their owners. The case of the snake which died by its master’s side when he fell down insensible,[202] if it can be relied upon, would show that even cold-blooded animals have tender hearts. Yet these are all instances of affection of lower animals to man. We must turn to the birds, that group which has gone on increasing in strength and numbers down to our day, to find that tender devotion which watches over the helpless nursling, defends the young at the risk of life, nay, like the peewit with the dragging wing, will even run in the face of death to lure the cruel destroyer away from the hidden nest. Natural history teems with examples of birds faithful to each other and pining even till death for the loss of a mate; while many birds, such as rooks, starlings, wild geese, swans, and cranes, not only live in companies and exact obedience from their members, but even set sentinels to watch, the duties of the office being faithfully fulfilled.