Reap what you sow is sort of the idea behind karma, though. It's been twisted around in popular culture so much that the true meaning isn't always apparent. People often forget the big picture idea of karma, thinking an action will have an immediate reaction.
All animals deserve respect, not just the cute and pretty ones.Without "bugs", we would lose about 1/3 of our food, be nose high in decay, and entire ecosystems (including everything that supports the popular animals!) would collapse.
Weasley: HMPK - Crackle: DT HM - Draco Malfoy: Crowntail - Hagrid: Giant - 6 neon tetras - bristlenose pleco - Haja: Madagascar hissing roach - Eddie Lizzard: leopard gecko - Cats: Kirby, Tails, Scootaloo