In the American anteaters and the pangolins among the Edentata no traces of teeth have been found at any age.
Between the long, extensile, worm-like tongue of the anteaters, essential to the peculiar mode of feeding of those animals, and the short, immovable and almost functionless tongue of the porpoise, every intermediate condition is found.
The existence of paired caeca was previously known in a few armadillos and anteaters, but Dr Mitchell has shown that they are common in these groups, while he has also recorded their occurrence in the hyrax and the manati.
Xenarthra (Anteaters, Sloths and Armadillos).
As to the Edentata, it is still a matter of uncertainty whether the pangolins (Pholidota) and the ant-bears (Tubulidentata) are rightly referred to an order typically represented by the sloths, anteaters, and armadillos of South and Central America, or whether the two first-named groups have any close relationship with one another.
The tamandua anteaters, as typified by Tamandua (or Uroleptes) tetradactyla, are much smaller than the great anteater, and differ essentially from it in their habits, being mainly arboreal.