See also the cladogram at right for a portrayal of the relationships between the species based on recent evidence.

This criterion infers the population viability of a species based on trends in the habitats upon which it specializes.

Most members of the genus have a variation in their calls, within the species, based on their geographical location.

Can't make snap judgments about a whole species based on a single individual, Harry.

There are two major genera included here, divided into species mainly based on the structure of the scales.

But it was redescribed as a different species based on molecular analysis.

Experts infer there may still be about 100 undescribed species, based on the rate of discovery.

It has been classified as a Vulnerable species based on the fact that it is known from only three locations.

In addition to the thirteen species based on British material, three were named by French researchers.

Rarer species based on fictional animals, such as the Dragonache, are also available.