It has two large shells open, into which when the little fishes swim, the naker, having notice given by the bite of the prawn, closes them immediately.

Thus, these little animals, though of different kinds, seek their food in common; in which it is matter of wonder whether they associate by any agreement, or are naturally joined together from their beginning.
There is some cause to admire also the provision of nature in the case of those aquatic animals which are generated on land, such as crocodiles, river-tortoises, and a certain kind of serpents, which seek the water as soon as they are able to drag themselves along.

We frequently put duck-eggs under hens, by which, as by their true mothers, the ducklings are at first hatched and nourished; but when they see the water, they forsake them and run to it, as to their natural abode: so strong is the impression of nature in animals for their own preservation.
XLIX.

I have read that there is a bird called Platalea (the shoveller), that lives by watching those fowls which dive into the sea for their prey, and when they return with it, he squeezes their heads with his beak till they drop it, and then seizes on it himself.

It is said likewise that he is in the habit of filling his stomach with shell-fish, and when they are digested by the heat which exists in the stomach, they cast them up, and then pick out what is proper nourishment.