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Sunday 11 October 2026

A small lime-green frog sitting on a leaf at night. Its legs and belly look partly see-through.
Photo: Michelle Monge-Velazquez · CC BY 4.0 · iNaturalist

Glass frog

When it sleeps, it packs about 89% of its red blood cells into its liver and becomes two to three times more see-through.

Lives in
RainforestPlants along forest streams, from southern Mexico to north-western South America
More about the glass frogScientific name, size and Red List status
Scientific name
Hyalinobatrachium fleischmanni
Size
22–25 mm long, snout to vent
IUCN Red List
Least concern

Not threatened at the moment, according to the IUCN Red List. See the assessment

Fact source: Taboada et al., 2022

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This week

Every animal so far
  1. Mon 19Basket star
  2. Tue 20Alpaca
  3. Wed 21Sociable weaver
  4. Thu 22Gumboot chiton
  5. Fri 23Cape dwarf chameleon
  6. Sat 24Northern paper waspToday
  7. Sun 25Tomorrow’s animalin 23 h 35 min

Why Animall

People can’t care about animals they have never heard of.

Scientists still discover thousands of new animal species every year, while many others are disappearing because of habitat loss and climate change. Some die out before anyone has described them.

10,000+

new animal species are described every year.

University of Arizona, 2025

86%

of species on Earth, and 91% in the ocean, have not been described yet.

Mora et al., 2011

73%

average drop in monitored wildlife populations between 1970 and 2020.

WWF Living Planet Report, 2024