3819. Beasts also have no skill in arts or sciences, as the mechanical, physical, philosophical, and others; still they are in them, and indeed, like the body of man, in their most hidden arcana, and from nature they know many more things than man by all his arts and sciences, as for instance they know how to construct nests, as the birds; to form webs, as the spider; to enwrap themselves in little silken houses, as the silk-worm; to form beautiful cells and adjust them, as bees; besides other things. These things are scientifics which beasts know; man by his sciences does not reach so far. Wherefore sciences and things of art are such things as man has in common with the beasts, on which account they alike regard the natural life, for ends are terminated in nature.