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Cownose ray

Cownose ray

Not on Exhibit

Animal Facts

  • Scientific Name

    Rhinoptera bonasus

  • Animal Type


  • Diet

    clams, large snails, lobsters, oysters, crabs

  • Size

    to 7 feet (2.1 m) from wingtip to wingtip

  • Relatives

    bat rays, manta rays, stingrays, spotted eagle rays; Family: Myliobatidae

  • Habitat

    Open Waters

  • Range

    Western Atlantic: southern New England to northern Florida and throughout the Gulf of Mexico, migrating to Trinidad, Venezuela and Brazil

Natural History

Cownose rays have a unique feature—long, pointed pectoral fins that separate into two lobes in front of their high-domed heads. A crease in the lobes and a notched head create a cow-nose likeness that gives these rays their name. Cownose rays use their flexible fin lobes to probe the seafloor for prey, like clams. After detecting buried prey, they dig deep depressions in the sand by flapping their pectoral fins and, at the same time, sucking sand through their mouths and out their gill slits. As they forage, large schools of rays can stir up huge clouds of silt over a large area.

The rays' eyes and spiracles are on their brown upper bodies, and their mouths are on their white or yellowish underbellies. The rays have large, flat tooth plates on both jaws that they use to crush hard-shelled prey. The rays spit out crushed shells and eat the soft body parts.


Cownose rays mature relatively late and have few offspring. However, these animals aren't threatened. There was some concern in Chesapeake Bay that an increase in the number of these rays was harming the already declining oyster population. New research disputes whether the cownose rays were actually causing the decline in oyster abundance.

Cool Facts

Cownose rays are known for their long migrations in large schools. They are strong swimmers, able to cover long distances. In the Atlantic Ocean, their migration is northward in the late spring and southward in the late fall. The population in the Gulf of Mexico migrates in schools of as many as 10,000 rays, clockwise from western Florida to the Yucatan in Mexico. 

Cownose rays have poisonous stingers, but even in large groups they're shy and not threatening. In 1608, Captain John Smith, an East Coast settler and explorer, learned about the nature of a cownose's sting. While Smith was spearing a ray with his sword near the Rappahannock River, the ray defended itself by stinging Smith in the shoulder. The pain was so terrible that the crew were convinced Smith was dying, so they dug a grave for him. But John Smith overcame the pain and felt well enough that evening to eat the ray for supper. The place where this happened is still known as Stingray Point. 

As this ray swims through the ocean, its wingtips often break the surface, resembling the dorsal fin of a shark, which sometimes causes undue alarm for swimmers and divers. Occasionally, they jump out of the water and land with a loud smack, a behavior thought to be a territorial display.

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