The parasites of the wolf, jackal, and fox family (canid) have especial interest, as including those of the dog.
Domestic dogs, again, have varied more in size and in form than the whole family of canid in a state of Nature.
When compared with all known members of the family of canid they betray a distinct and abnormal origin.
Indeed, no other canid that we know of has teeth so much adapted to a frugivorous diet as are those of C. fortidens.
De Blainville ('Ostographie, canid,' p. 137) has also seen an extra molar on both sides.
Amongst mammals, we see it strikingly displayed in Bats, and in a lesser degree in the Felid and canid.
The oldest and most central stock appears to be that of the dog family (canid).
Social animals are the most easily subjugated by man, and several species of canid hunt in packs.