Letters 121.19

People may ask: “How can an animal at birth have an understanding of things wholesome or destructive?” The first question, however, is whether it can have such understanding, and not how it can understand. And it is clear that they have such understanding from the fact that, even if you add understanding, they will act no more adequately than they did in the first place. Why should the hen show no fear of the peacock or the goose, and yet run from the hawk, which is a so much smaller animal not even familiar to the hen? Why should young chickens fear a cat and not a dog? These fowls clearly have a presentiment of harm—one not based on actual experiments; for they avoid a thing before they can possibly have experience of it.

Seneca, Letters to Lucilius 121.19, translated by Richard Mott Gummere