At seven years old, Newt Scamander spent hours enthusiastically taking apart the bodies of Horklumps and getting quite dirty in the process (FB).
Newt Scamander was born in in 1897 and recalls dissecting Horklumps when he was seven (FB).
Newt Scamander dismembers Horklumps in his bedroom
Certainty Stated in canon
Location in Canon Fantastic Beasts and Where to Find Them (book)
Type of Event Wizarding world