Alopias pelagicus, commonly known as the pelagic thresher shark, is a species of shark found in deep oceanic waters. It is characterized by its long, slender body and a distinctive long tail, which can be nearly as long as its body. This species typically inhabits tropical and subtropical regions and is known for its ability to dive to great depths. The pelagic thresher shark primarily feeds on small fish and squid, using its tail to stun prey. It is a pelagic species, meaning it lives in the open ocean rather than near the sea floor. Due to overfishing and habitat loss, Alopias pelagicus is considered vulnerable by the IUCN Red List.