其 that

OK, now you learned the obsolete kanji for これ、 so now you get to learn the obsolete kanji for それ! (其れ) Same deal: it's still useful . . . but only as a radical.

其 is strong for KI. So you can say,

THAT animal's EYES and LEGS are the KEY to its survival (Talking about chameleons here. Fuck changing colors and catapult tounges - prehensile suction-legs and 360-vision eyes are what really makes those little goons such ruthless predators)

(Actually that was kind of a long detour for an at-best passable mnemonic, but) (actually there is no 'but, since chameleons are THE BEST SHIT)