Collecting all 5 Beast cards will give you the option to view a
description on all minor enemies found in the game. This can be viewed
in your notebook.
Personally, I haven't seen a Gytrash.
Gulliver Pokeby (1750 - 1839)
Description : Expert on magical beasts. First to identify meaning of
Location : In a chest in Dumbledore's study.
Derwent Shimpling (1912 - Present)
Description : Ate an entire Venomous Tarantula for a bet and survived
though is still purple.
Location : In a northeast corner of the southern portion of the
Herpo the Foul (Ancient Greek)
Description : First known creator of the Basilisk.
Location : In the secret chamber of the Reading Room.
Newt Scamander (1897 - Present)
Description : Celebrated author of 'Fantastic Beasts and Where to Find
Location : Colin Creevey gives you this after freeing him from his cell
Gondoline Oliphant (1729 - 1799)
Description : Famous for studies of life and habits of trolls. Clubbed
to death while sketching.
Location : Ginny gives you this after you buy her a Potion Kit (Main
Task, Subtask 1)