Changes

*Sumatran rhinoceros ''Dicerorhinus sumatrensis''

*Sumatran rhinoceros ''Dicerorhinus sumatrensis''

A number of extinct varieties are also known, notably the woolly rhinoceros of the [[Ice Age]], a contemporary of the Woolly [[Mammoth]]. Several frozen corpses of this animal have been discovered in the [[Siberia]]n [[permafrost]].

A number of [[extinct]] varieties are also known, notably the woolly rhinoceros of the [[Ice Age]], a contemporary of the Woolly [[Mammoth]]. Several frozen corpses of this animal have been discovered in the [[Siberia]]n [[permafrost]].

==Description==

==Description==

The head is large and bears the horns for which it is named.  The genera ''Rhinoceros'' have a single, large horn; the remaining species have two, of which the front horn is longer.  Lacking a bony core, these horns are made entirely of keratin - the same material found in hair and fingernails - which continue to grow throughout life.

The head is large and bears the horns for which it is named.  The genera ''Rhinoceros'' have a single, large horn; the remaining species have two, of which the front horn is longer.  Lacking a bony core, these horns are made entirely of keratin - the same material found in hair and fingernails - which continue to grow throughout life.

== References ==

== References ==