Wildlife of the World
Puzzle 20 · Amazonia and the Neotropics · Page 38 in print
Glassfrog Streams
Many glassfrogs have transparent undersides that reveal internal organs; many of these small forest frogs lay eggs above streams, and the newly hatched tadpoles drop into the water below.
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A fringe-limbed treefrog, one member of the glassfrog family, rests on a leaf.
Species reference for Glassfrog Streams. The photograph does not necessarily show the population or place named in the puzzle.
(c) Kai Squires, some rights reserved (CC BY) · CC BY 4.0 · Original recordImage changes
Resized and converted to JPEG for display; no subject alteration.

A ghost glassfrog shows the delicate build of these streamside frogs.
Species reference for Glassfrog Streams. The photograph does not necessarily show the population or place named in the puzzle.
(c) Brian Gratwicke, some rights reserved (CC BY) · CC BY 4.0 · Original recordImage changes
Resized and converted to JPEG for display; no subject alteration.
The words
Bromeliads
Air plants where some glassfrogs lay eggs.
Eggs are laid above the water on leaves, rocks or bromeliads.
Cloud Forests
Glass frogs are particularly diverse in montane cloud forests.
Clutches
Groups of eggs laid together; in some glassfrog species, a male guards more than one clutch.
Costa Rica
Glass frogs are diverse in Costa Rica and Panama.
Creek Bed
Tadpoles live on the bottoms of streams.
Egg Guarding
Parental care is common and males guard clutches.
Frog Flies
'frog flies' lay eggs in glassfrog eggs and their maggots eat the embryos.
Glassfrog
Glass frogs are named for the transparent skin of their undersides.
Leaf Litter
Tadpoles live in the muck and leaf litter on stream bottoms.
Metamorphosis
Glassfrog tadpoles feed in the stream until metamorphosis turns them into froglets.
Organs
The transparent skin shows the viscera (internal organs).
Animal Diversity Web (opens a new tab) · Wikipedia (opens a new tab)
Peep
The glass frog's call is a high peep, like fine crystal.
Streams
Glass frogs live high in trees overhanging mountain streams.
Tadpoles
The young that drop into the stream.
The tadpoles hatch and fall into the water below.
Tree Frogs
Glass frogs are a family of translucent-skinned tree frogs.
Sources
- Glassfrog Streams (source capture)Animal Diversity Web, University of Michigan Museum of Zoology
- Glassfrog Streams (source capture)Wikipedia