Another thing to be mindful of, is the wildlife you encounter. This is extremely important because you will need to know how to defend yourself with your wand if you use the Bubble-Head Charm, or Gillyweed. This is also important, because if you transform into your animal form, make sure that you turn into a predator, not prey. Otherwise, there is a great chance you might get eaten. There are several magical creatures that reside underwater that you should be aware of. For information regarding these creatures, see Fantastic Beasts and Where to Find Them. Note; some of these creatures are not particularly dangerous, but you should still be aware of them. Here they are:

Merpeople

Grindylow

Lobablug

Mackled Malaclaw

Hippocampus

Sea Serpent

Ramora

Shrake

Dugbog

Kappa

Kelpie

Plimpy

The Giant Squid (Black Lake only)

There are also some non-magical creatures that can pose a threat. These include Sharks, Jellyfish, Sea Snakes, and others. Make sure you know plenty of defensive spells before going underwater. Note; some of these creatures only reside in salt water, and others only in fresh water.



Grindylow