Rana aurora - Wikispecies

Rana (genere) - Wikipedia

Variation in species richness, composition and herpetological

Frog, Ultimate Pop Culture Wiki

Rana arvalis - Wikispecies

Reclassification of the Sack-bearer Moths (Lepidoptera

Frog, All Birds Wiki

California Red-Legged Frog (Rana draytonii) at Herpedia™.com

frogs and toads articles - Encyclopedia of Life

Rana (chenero) - Biquipedia, a enciclopedia libre