Durophagy

Durophagy is the feeding behavior of animals that consume hard-shelled or otherwise resistant prey by crushing, grinding, or hammering to access the edible parts inside. The term derives from the Greek duro- meaning hard and -phagein meaning to eat. Durophagy is found in a wide range of taxa, including invertebrates such as certain mollusks and crustaceans, and vertebrates such as mammals, reptiles, and fishes. Predators may rely on specialized dentition, robust jaws, or beak-like structures to crack shells, as well as on behavioral strategies such as using external tools.

Prey and adaptations: Common hard prey includes mollusks (snails, clams, and other shells), crustaceans (crabs, barnacles), and hard-bodied echinoderms, as well as bone in some contexts known as osteophagy. Adaptations facilitating durophagy include thick, flat or molariform teeth for crushing; reinforced jaws and skulls; and in some species, the use of external tools such as rocks or anvils to break shells.

Examples: Well-documented modern durophages include sea otters, which crack mollusks and urchins on land using stones as anvils; mantis shrimps, which deliver high-energy blows to hard prey with specialized claws; and some pufferfish, which chew through mollusk shells with beak-like dental plates. In reptiles, certain turtles and some crocodilians feed on hard-shelled prey. Durophagy also appears in the fossil record, where taxa are identified by crushing dentition and jaw mechanics that indicate shell- and bone-crushing capabilities.

Ecological significance: Durophagy influences prey defenses, leading to escalations in shell thickness or armor, and shapes predator–prey dynamics and niche partitioning within ecosystems.