| referring to a stomach with "saccules,"
or sack-like compartments, in which bacteria slowly break down cellulose,
thereby providing more useable calories. Among the primates, only the Colobinae
(colobus, langurs, and proboscis monkeys) have this characteristic. Cows
and related animals also have sacculated stomachs. |
 |
| usually semi-arid plains regions covered with grasses
and occasional scattered trees. |
| referring to animals that spend much of their day on
the ground but usually return to the trees to sleep. See arboreal and terrestrial.
Eg: Chimpanzees |
| the soft tissue separating the two nostrils of a mammal’s
nose. |
| A model of evolution, a gene's eye view of
natural selection. Genes are replicators, individuals are their vehicles.
Replicators make copies of themselves. Successful replicators make more
copies than unsuccessful replicators. Improved vehicles (bodies) promote
their success. |
| referring to anatomical differences between males and
females of the same species. Non-human Primate males are usually significantly
larger than females. This is especially true of semi-terrestrial monkeys
and the great apes. |
| a nearly hairless large swollen patch of
skin around the genital area that becomes very prominent when females are
in estrus. These areas swell with fluids and turn bright pink or red due
to hormonal changes that occur in preparation for ovulation. The sexual
skin also produces odors that excite males of the species. They become highly
attentive to the females at this time. Sexual skins are found among many
of the Old World monkey species as well as the chimpanzees and bonobos.
|
| the stage of maturation in which animals
are beyond infancy and early childhood but are not yet fully grown. |
| the ability to see things in three dimensions
(3-D). Stereoscopic vision is what allows for true depth perception. See
peripheral vision and binocular vision. |
| a thing, such as a word, that can represent
something else that is not here and now. The meaning of a symbol is arbitrary
and is given by those who use it. |