In "Harry Potter: The Creature Vault" by Jody Revenson, the plant that resembles cacti is called the "Horklump." These plants have a spiky appearance similar to that of cacti, but they are actually more akin to a type of magical fungus. Horklumps are known for their ability to reproduce quickly and are often considered a nuisance in the wizarding world.
Dobby.
Owls
Buckbeak is a hippogriff (A magical half-horse half-eagle creature).
Buckbeak is a creature that Hagrid has in a magical creatures lesson in the third harry potter movie. To most, it would seem it is a mixture of a bird, and a horse. the proper name of this creature is a hypogriff.
Buckbeak, the hippogriff.
rat
tabby cat
Errol was a great gray owl, known as a Strix nebulosa.
Mars is the real life name of the owl that played Ron's pet, Pigwidgeon.
Sure.
Dobby.
The creatures in Harry Potter that drain people of their souls are called dementors.
Harry and Fawkes defeated a Basilisk.
Owls
Fawkes is a phoenix.
The Boggart.
Boggart or kneezle