Harold was very good at hiding. Some sharks also hide very well.
Some sharks are hard to see because they blend in with the reefs and seabeds where they live. This is called camouflage.
The angel shark is sandy-brown in color and has a flat body. It can lie flat on the seabed without being seen.
The wobbegong shark has dark-patterned skin. This design helps it hide among the coral and rocks where it lives.
Both kinds of these sharks lie very still and wait for their prey to swim by. If a fish swims too close, they quickly snatch it.