Pick of the Day: The Secret Life Of Rockpools
9pm, BBC4
Paleontologist Richard Fortey discovers the extraordinary lives of rockpool creatures, including the snakelocks anemone.
To help explore this unusual environment he is joined by leading UK marine biologists in a dedicated laboratory at the National Marine Aquarium in Plymouth.
Here and on beaches around the UK, startling behaviour is revealed, with new insights into how these animals cope.
Many have survived hundreds of millions of years but humans may be their biggest challenge yet.