Hammerhead flatworm (land planarian)

Moist, shaded soil, leaf litter, gardens, greenhouses, and beneath logs or stones; often introduced in temperate regions.

Predatory, feeding mainly on earthworms, slugs, snails, and other soft-bodied invertebrates. It captures prey with mucus and an extendable pharynx, sometimes using toxins.

Mostly nocturnal and highly moisture-dependent, becoming active after rain. It glides on mucus, can regenerate from body fragments, and lays eggs or produces clonal fragments depending on species.

Generally harmless to people, but may reduce earthworm populations and disrupt soil ecosystems. It has little recognized ecological benefit outside its native range.