In most quadrupeds, as in ourselves, the fore-arm contains distinct bones called the radius and the ulna.

As we know the parentage of domesticated birds far better than of most quadrupeds, we will glance through the list.

Few animals can have a larger proportion of marrow than the elk, as the bones are more hollow than those of most quadrupeds.

Their unions are usually in pairs, and for life; and with them, unlike the practice of most quadrupeds, the male labors for the young.