A new animal every day

Today · Friday 30 October 2026

A brown spider underwater on an algae-covered stone, its body wrapped in a shiny silver bubble of air.
Photo: harry beaman · CC BY 4.0 · iNaturalist

Picked by voters

Diving bell spider

It’s the only spider known to spend its whole life underwater, in a nest it fills with air from the surface.

Lives in
PondsPonds, lakes, marshes and slow streams from Europe across Siberia to Japan
More about the diving bell spiderScientific name, size and Red List status
Scientific name
Argyroneta aquatica
Size
8–19 mm long
IUCN Red List
Not evaluated

The IUCN Red List has assessed 175,909 species. This one has not been assessed yet. What this means

Fact source: Animal Diversity Web

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This week

Every animal so far
  1. Mon 26Upside-down jellyfish
  2. Tue 27Boxer crab
  3. Wed 28Axolotl
  4. Thu 29Four-eyed fish
  5. Fri 30Diving bell spiderToday
  6. Sat 31Tomorrow’s animalin 21 h 38 min
  7. Sun 1

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