Monster Sizes

Tiny - sprites, rats, imps, moths, bats, toads, frogs, crows
Small - large spiders, beetles, small devils, giant rats, kobolds
Medium - hounds, ghouls, minor devils, humanoids, orcs, gargoyles
Large - drakes, trolls, ogres, dire wolves, minotaur, Chimera, horse
Huge - giants, phoenixes, stormborn dragons, cyclops, sphinx
Gargantuan - ancient dragons, elder wyrms, world-serpents, titan-scale giants