In Fantastic Beasts and Where to Find Them, Ron Weasley adds nine "X"'s to Acromantula's Classification. This is a reference to Ron's fear of spiders. This may also be contributed to by Aragog's offspring almost killing them, only being saved by the chance appearance of his father's car. Ron also adds seven "X"'s on the pixie entry, with the additional remark of "if you're Lockhart".