Tiger sharks are very rare in New England, but a local marine biologist says they’re slowly growing more common.

Chatham: On Friday, a white shark was spotted about 30 feet off North Beach Island, traveling south. The next morning, an acoustic receiver detected an 11-foot shark that researchers named "Baobab" in the area. Also on Saturday, a user reported that a shark was seen about 200 feet off North Beach Island and was headed south.

Maps are showing the number of shark sightings spiking on the East Coast, likely as the ocean predators make their way to warmer waters