Overview
The Bat Ray (Myliobatis californica) is a majestic, broad-winged eagle ray native to the dynamic kelp forests and protected coastal bays of the eastern Pacific Ocean. Gliding through underwater giant kelp cathedrals with graceful, undulating strokes of its triangular pectoral ‘wings,’ this powerful mollusk specialist plays an indispensable role in maintaining the health of coastal benthic ecosystems.
Biology and Physical Characteristics
Myliobatis californica features a broad, diamond-shaped disc with long, pointed triangular pectoral wings and a prominent, heavy, bulbous head with wide-set eyes elevated above the body. Its dorsal surface is deep slate-brown, jet-black, or olive-grey, while the underside is pure snowy white. Inside its mouth, its teeth are fused into heavy, flat pavement-like grinding plates designed to crush solid rock-hard clam shells.
Behavior and Ecology
Bat Rays are powerful ecosystem engineers. To feed on burrowing clams and fat innkeeper worms, they hover inches above muddy bottoms and flap their wings vigorously, excavating massive feeding pits up to four meters across that expose buried prey and uncover food for opportunistic smaller fishes like surfperch and croakers.
Conservation and Human Impact
Assessed as Least Concern by the IUCN, Bat Rays maintain healthy populations along the Pacific coast of North America. Protected from commercial targeted fisheries, they are frequently featured in public aquariums due to their curious, gentle demeanor and willingness to glide directly to the surface of shallow touch tanks.
Interesting Factoid
Equipped with thick, pavement-like dental plates made of solid modified teeth, an adult Bat Ray can generate crushing forces that easily shatter the rock-hard shells of whole clams and abalones like peanut shells.