Sea sponges might look simple, but they’re some of the most surprising animals in the ocean. Here are ten fascinating facts that prove sponges are anything but boring.
1. They’re animals – not plants.
Even though they don’t move around, sea sponges are animals. They don’t photosynthesise and must get food from their environment.
2. They’ve been around forever.
Sponges are among the oldest animal groups on Earth, with fossils dating back over 500 million years – long before dinosaurs existed.
3. No brain, no problem.
Sponges have no brain, nerves or muscles. Instead, they rely on specialised cells that work together to keep them alive.
4. They eat by filtering water.
A single sponge can filter thousands of litres of seawater a day, trapping tiny food particles like bacteria and algae. No Krabby Patties for them!
5. Water flows through them constantly.
Sponges have lots of tiny holes that pull water in, and a larger opening where the filtered water flows out – like a living pump.
6. Some sponges are carnivorous.
Believe it or not, a few deep-sea sponges trap and digest small crustaceans instead of filtering food from water.
7. They can regenerate amazingly well.
If a sponge is broken into pieces, each piece can grow into a whole new sponge under the right conditions.
8. They come in wild shapes and colours.
From bright yellows and purples to tubes, fans and barrels, sponges are some of the most colourful animals on coral reefs.
9. They’re chemical geniuses.
Sponges produce powerful chemicals to defend themselves. Some of these compounds are being studied for antibiotics and cancer treatments.
10. They help keep oceans healthy.
By filtering water and recycling nutrients, sponges play a key role in maintaining clean, balanced marine ecosystems.
Next time you spot a sponge underwater, remember: you’re looking at one of the ocean’s oldest and cleverest survivors.
There is no sponge more famous than SpongeBob SquarePants. Catch his latest movie at cinemas now. Watch the trailer here.
