costa-rica-pura-vida
libutron:

Centrolenid glass frog
Anurans of the family Centrolenidae are a diverse clade of arboreal frogs distributed across tropical America.
Centrolenid frogs derive their common name from the transparent venter, through which internal organs can be seen in many species. Most Centrolenids are a shade of green, ranging from light lime green to dark green. Members of this family also have green bones as a result of green bile salts.
Studies have shown that glass frogs contain a unique pigment in their skin that reflects the same wavelength infrared radiation that plants do, possibly another adaptation for concealment.
Most glass frogs are small (30 mm) with one exception, Centrolene gekkoideum, which attains a length of 77 mm.
Reference: [1]
Photo credit: ©Oliver C. Wright | An unidentified glass frog (Centrolenidae) taken at night in the rainforest of Costa Rica.

libutron:

Centrolenid glass frog

Anurans of the family Centrolenidae are a diverse clade of arboreal frogs distributed across tropical America.

Centrolenid frogs derive their common name from the transparent venter, through which internal organs can be seen in many species. Most Centrolenids are a shade of green, ranging from light lime green to dark green. Members of this family also have green bones as a result of green bile salts.

Studies have shown that glass frogs contain a unique pigment in their skin that reflects the same wavelength infrared radiation that plants do, possibly another adaptation for concealment.

Most glass frogs are small (30 mm) with one exception, Centrolene gekkoideum, which attains a length of 77 mm.

Reference: [1]

Photo credit: ©Oliver C. Wright | An unidentified glass frog (Centrolenidae) taken at night in the rainforest of Costa Rica.