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Jaime Culebras

A male glass frog, H. valerioi, guards three egg clutches.

The organs and developing eggs of a female glass frog, Hyalinobatrachium mashpi, are seen in a photo taken on glass.

An H. mashpi parent guards its eggs. Parental care is common among glass frogs.

The organs and eggs of a female H. mashpi are seen clearly through her translucent skin.

Hyalinobatrachium mashpi, one of the newly discovered species, is known for its high-pitched whistle and the black dots covering its body, which could act as camouflage in its rainforest environment.

A male sun glass frog’s heart beats visibly through its chest in western Ecuador. Males of this species are actively involved in protecting and caring for their embryos.

A female Magdalena giant glass frog (Ikakogi tayrona) covers her eggs in the Sierra Nevada de Santa Marta region of northeastern Colombia. This one-inch-long species is unusual in that mothers care for their embryos.

The Manduriacu glass frog (Nymphargus manduriacu) was scientifically described just a few years ago. The rare yellow-spotted frog is an opportunistic hunter, waiting until its prey—a small insect or spider—walks by, and then pouncing.

An arachnid eats eggs of the emerald glass frog (Espadarana prosoblepon) in northwestern Ecuador’s Río Manduriacu Reserve. Parents of this species do not care for their young, leaving the eggs vulnerable to predation.

Embryos of the Wiley’s glass frog (Nymphargus wileyi), endemic to Ecuador’s eastern Andes, hang from the tip of a fern leaf. When the eggs hatch into tadpoles, they’ll fall into the stream below to continue their development.