Hydroids are tiny animals with tentcales that live in colonies attached to rocks or seaweed.
You will often se them growing like white fur on kelp plants.
Hydroids on Kelp (Photo: Paul Tyler)
Each white filament is a series of tiny animals
Hydroids on Kelp (Photo: Sue Scott)
Sometimes the hydroids completely cover the kelp leaf
Sea Spiders Feeding on Hydroid (Photo: Paul Tyler)
This is a larger hydroid colony that grows from the rock. These hydroids are being eaten by sea spiders.
by Paul Tyler