 Cat  Felis catus  Tiger  Felis pardina  Jaguar  Panthara tigrus  Leopard  Panthara pardus  Crayfish  Cambarus zophonaetes .    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Cambarus there are two forms of males, one of which has testes in functional activity, while in the other these organs are small and quiescent: the one form changes into the other when the testes pass from the one condition to the other.    From Wordnik.com.  [Hormones and Heredity] Reference

 Cat  Felis catus  Tiger  Felis pardina  Jaguar  Panthara tigrus  Leopard  Panthara pardus  Crayfish  Cambarus zophonaetes  Scientific Name Rules: • Genus name capitalized 3.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference