dogs' and cats' paws and tracks
Glossary by Category
Glossary All Words
An animals with a spinal column (
An appendage to the main body of an organism.
For example, an arm, leg, flipper or wing.
Remaining as a remnant or trace of a structure that had been present in the ancestors of a species.
Most mammals, including cats and dogs, are quadrupeds.
Primates (including humans), kangaroo rat, springhare, kangaroos, wallabies, and the ground pangolin are notable exceptions to this generalization.
to reveal more
A to C
D to F
G to L
M to O
P to Q
R to S
T to Z
A four-footed animal.
This group includes all
that are descendants of four-footed ancestors.
In some instances, primitive
of tetrapods have been modified, lost or become
. Modifications include wings and fins. The limbs of snakes are vestigial.
Therefore marine mammals with fins, snakes, legless lizards, legless amphibians, and birds are categorized as tetrapods, although they are not
The taxonomic superclass
includes over 28,000 species of amphibians, reptiles, birds and mammals.
© revealing paws 2011