Chaunas marinus) are commonly found hopping around man-made structures at night. Although an invasive exotic species in many other parts of the world, the Cane toad is native and incredibly common in Costa Rica.
Rhaebo haematiticus is cryptically-patterned. Some individuals can have pronounced "eye-spot" markings located toward the rear of their back.
This small litter frog is the most common amphibian found on the grounds of La Selva Biological Station. Although variable in color, it is often a mottled brown (as above) with tubercles marking the skin. It can usually be identified by its white throat, yellow stomach, and red groin. Unlike many other congeners, however, it lacks toe pads.
Craugastor largehead. Although it can be readily identified by its "large head", no other anuran species has a white spotted throat and stomach. This species was puzzling for me, however, as I only had success finding them on one trail.
C. fitzingeri is often found nocturnally perched on or near the forest floor during light rain.
Pristimantis cerasinus can be identified by the dark red coloration on the back of its legs (not shown above). I had success finding this species perched on vegetation a few feet above the ground.
Gastrophryne pictiventris. I suspect this species is not commonly encountered due to its fossoriality. However, I did flip the one above under a palm leaf, and I found two moving out during a storm.
Oophaga pumilio. Incredibly common, incredibly beautiful. And for some silly reason, I never got a picture I'm pleased with. This species has some remarkable reproductive behavior. Unlike hylid species that lay eggs in or near large water sources, female O. pumilio lay fertilized eggs in moist leaf litter. Eventually, the males collect the hatching tadpoles on their back and carry them to bromeliads, where they are deposited. In these small "cups" of water, the tadpoles develop further, feeding on unfertilized eggs deposited by their mother.