A tiny frog from the Amazon, about as big as a thumbnail. It’s a Bassler’s Humming Frog, Chiasmocleis bassleri, found by our group in Loreto, Peru, in January of 2023.

A tiny frog from the Amazon, about as big as a thumbnail. It’s a Bassler’s Humming Frog, Chiasmocleis bassleri, found by our group in Loreto, Peru, in January of 2023.

A Convict Treefrog (Boana calcarata) we found in Peru a few years back, near Iquitos. This one is showing the black and white bars on its sides that give it its name.

We were shown these amazing little primates, the smallest in the world; Western Pygmy Marmosets (Cebuella pygmaea). Each is only about the size of a hand, with the smallest we saw likely comfortable curling up in a donut. They stay in one tree and have a tiny home range, excavating holes in bark to get to the sap they eat. They were skittish but as they didn’t go far, relatively easier to photograph than other primates in my experience. Loreto, Peru.


Youlatos, D. (2009). Locomotion, postures, and habitat use by pygmy marmosets (Cebuella pygmaea). In P. Garber, A. Estrada, J. Bicca-Marques, E. Heymann, & K. Strier (Eds.), South American primates: Comparative perspectives in the study of behavior, ecology, and conservation (pp. 279–296). Springer. https://www.academia.edu/download/45603455/4_Youlatos_2009_Smallest_20Anthropoids.pdf