Bat Ray

Fascinating facts about the Bat Ray

• At nearly a 2 m (5 ft 11 in) wingspan and a mass that can top 91 kg (201 lb), the bat ray rivals a small horse in size, though most individuals weigh closer to 90 kg (200 lb). A single record even lists a 240-lb individual, highlighting how much they can vary. Their massive, wing-like pectoral fins let them glide over sand like a living airplane.
• When a mother bat ray gives birth, the pups emerge tail-first, still wrapped in their wing-fins and with a flexible, sheath-covered venom spine that falls off within hours. Litters range from two to ten young after a nine-to-twelve-month gestation, and the newborns measure 220–305 mm across the disc. This live-birth strategy lets the juveniles start hunting the seabed almost immediately.
• Using their snout, bat rays dig trenches up to 20 cm deep and carve pits as long as 4 m to expose buried clams, crabs, and worms. Their flat, pavement-like teeth then crush shells, spitting out the hard bits while swallowing the flesh.
• Only one albino bat ray has ever been documented, spotted in 1865 off Baja California’s west coast, a rarity that underscores their normally dark coloration. A separate oddity, a juvenile male with three cephalic horns instead of the usual two, suggests morphogenetic plasticity, showing how environmental or genetic shifts can reshape even a ray’s head.
• Bat rays inhabit waters from the surface down to 150 ft, but they’re most often found between 8 and 100 ft. Their range stretches from central Oregon through the Gulf of California and out to the Galápagos, favoring muddy sloughs, sandy bays, kelp beds, and rocky shores. Seasonal hotspots include San Clemente in spring, Santa Rosa in March-April, and Anacapa Island during summer.

At a glance

About the Bat Ray

The bat ray (Myliobatis californica) glides through the coastal waters of the Pacific with a silhouette that blends the sleekness of an eagle ray and the angularity of a diamond ray. Its wing-like pectoral fins spread to a wingspan of up to 1.8 m (5 ft 11 in), ending in blunt points, while a broad, raised head shelters laterally placed eyes and a subtle horizontal depression between them. The dorsal surface shimmers black or dark brown, contrasting sharply with a white ventral side that is interrupted only near the disk edges. A whip-like tail, incomplete and cartilaginous, bears at least one venomous spine at its base, a defensive tool that rarely harms humans. These rays inhabit muddy or sandy sloughs, estuaries, kelp beds, and rocky shorelines from central Oregon to the Gulf of California, even reaching the Galápagos Islands. They favor flat, sandy patches between rocks and are commonly seen around offshore islands such as San Clemente, Anacapa, and Santa Rosa, typically between 8 and 100 ft below the surface. Bat rays are opportunistic generalists, using their powerful pectoral fins and a snout that can carve trenches up to 20 cm deep to expose hidden mollusks, crustaceans, and small fish. Their flat, pavement-like teeth crush shells, ejecting the hard fragments while swallowing the flesh. In Humboldt Bay, clams dominate their diet, whereas in warmer waters of Baja California Sur they shift toward pelagic crabs and peanut worms when sea-surface temperatures rise. A strikingly rare trait recorded in 1865 off the west coast of Baja California was an albino individual, underscoring the species’ capacity for morphogenetic plasticity, a theme echoed by a juvenile male with an abnormal three-horn cephalic formation, hinting at the evolutionary flexibility of their head structures.

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