Though a flumph's underside is ringed with an array of acidic spikes that they use to hunt small prey, they are nearly defenseless against most attackers and usually attempt to flee when threatened. If cornered, a flumph can emit a foul-smelling spray capable of temporarily incapacitating enemies while warning nearby allies of their presence. This olfactory defense mechanism causes flumphs to feel more kinship with terrestrial creatures than with the jellyfish to which they bear a closer physical resemblance.