The first known camels have been reported from rocks of upper Eocene
age, and these small forms underwent considerable specialization of
teeth and limbs as they developed in size. Many of the camels that lived
during the middle Cenozoic had long legs which were well adapted to
running and long necks which would have allowed the animals to browse on
the leaves of tall trees.
The earliest known Texas camels were found in rocks of Oligocene age,
and camels, like horses, must have been abundant in Texas during the
Pleistocene for their fossilized remains are common in many parts of the
State.
[Illustration: Plate 49
CENOZOIC MAMMALS]
WOOLLY RHINOCEROS × ¹/₂₀
WOOLLY MAMMOTH × ¹/₄₀