Legend:

Baird's tapir (Tapirus bairdii)
Brazilian tapir (Tapirus terrestris)
Woolly Mountain tapir (Tapirus pinchaque)
Asian or Malayan tapir (Tapirus indicus)

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"The first animals with hoof-like nails, instead of claws, appeared in the Eocene, and from then onward, larger and larger hoofed plant-eaters appeared. Quite early on the hoofed mammals, or ungulates, split into two distinct groups: artiodactyls (even-toed ungulates) and perissodactyls (odd-toed ungulates). The modern artiodactyls include the antelopes, deer, giraffes, goats, pigs, hippopotamuses, camels and llamas, while the perissodactyls are today represented by the horses, zebras, tapirs and rhinoceroses. . . .

"Perissodactyls were initially much more successful than artiodactyls; most were small forest-dwellers like today's tapirs . . . and they died out as the forests waned."

The Diversity of Life
The World of Science (Series)
Andromeda Oxford Limited
11-15 The Vineyard, Abingdon
Oxfordshire  OX14 3PX
England
Copyright © 1989, 1991
ISBN 1 871869 03 X

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"The young in the whole family of pigs (Suidæ), and in certain rather distantly-allied animals, such as the tapir, are marked with dark longitudinal stripes; but here we have a character apparently derived from an extinct progenitor, and now preserved by the young alone. In all such cases the old have had their colours changed in the course of time, whilst the young have remained but little altered. . . ."

The Descent of Man,
and Selection in Relation to Sex
by Charles Darwin
Princeton University Press,
Princeton, New Jersey
Copyright © 1981
ISBN 0-691-08278-2
Page 184
Reprint of the 1871 edition
pub. by J. Murray, London