The goatfish seems powerless to escape as it's swallowed alive.

Moments later, a venomous barb inside the snail puts the fish out of its misery.

 

In a place where even seashells are deadly, remaining undetected is essential if you want to survive the night.

And simply hiding is not enough. Just a hint of your scent wafting into the current can attract trouble.

 

The parrotfish has come up with an elegant solution in a form of a sleeping bag made out of membrane.

It stops the smell spreading along the reef and being picked up.

It's a very good way if you're a parrotfish of ensuring you get a good night's sleep.

 

No one has ever filmed  a parrotfish making its cocoon before.

It starts by exuding a layer of mucous around its body.

It then draws water into its mouth and pushes it out of its gills, blowing up the mucous bubble around it.