Scientists recently described a new species of a tiny brown frog found in the Amazonian floodplain forests of Ecuador and northwestern Brazil. It looks nearly identical to related species but its slow, widely spaced out call sets it apart, researchers note in a study. “I’ve had to get into arguments because people said the frog I study is ugly,” lead author Marianna Borburema, who studied the species as an undergraduate student at the Federal University of Minas Gerais and is now a researcher at the University of São Paulo, told Mongabay by phone. “I find it absurd. The frog I study is beautiful! It is super cute.” “Super cute” specimen of the newly described Adenomera varcena species. Images courtesy of Marianna Borburema. Despite dazzling the study’s lead author, the evolution of the frog, named Adenomera varcena, hasn’t been one focused on appearances. Biologists call this a “cryptic species”, a species whose external traits can be very similar to related species. It is roughly 22 to 24 millimeters (0.9 inches) long and has brown skin and dark blotchy patterns. “Because of natural selection, the pressure isn’t on the frog’s appearance, it’s on the call,” said Borburema, who spent three weeks analyzing the frogs’ sounds. “We understand that evolution happens faster in their call because the song is what interests the female.” Related species typically call frequently, some up to 70 notes a minute. However, the songs of A. varcenas include just one to five notes a minute, the slowest rate documented…This article was originally published on Mongabay