The frog has been given the scientific name Rana kauffeldi, after Carl Kauffeld, an amphibian expert who claimed in the 1930s that a third species of leopard frog existed in the northeastern U.S.

Rana temporaria, the common European frog. It's one of four species whose populations were tracked over 10 to 29 years to show that higher temperatures are linked to faster aging and shorter ...

The frogs are nested in different areas of the evolutionary tree, with separate sister species, according to the genetic analysis. However, Koch notes that more data is needed to confirm the exact ...