A 15 foot great white shark swims 100 feet off of the Chatham shore on Sunday (via Cape Cod Shark Hunters)

Another great white shark was spotted off the shore of Cape Cod on Monday evening. This was the second reported shark sighting in two days, with a sighting of a 15 foot shark within 100 feet of a Chatham beach reported on Sunday. Six great whites were also seen in the Monomoy National Wildlife Refuge area on Tuesday.

Troopers from the Massachusetts State Police Air Wing observed the 14 foot shark as they flew over Chatham on Monday. They estimated that the shark was about 200 feet from the shore. The other shark was spotted and photographed by Cape Cod Shark Hunters’ George Breen while on a survey flight over Chatham on Sunday.

Shark sightings near Cape Cod have risen over the past few years, a phenomenon that researchers say supports their theory that the Cape is a breeding ground for great whites.

The team of shark researchers at OSEARCH have been working on tagging sharks when they come into the area. The expedition’s leader Chris Fischer says that the return of tagged sharks to the area year after year indicates that Cape Cod is a breeding ground.

“The dots are connecting,” says Fischer. One shark in particular may hold the key to solving the mystery. The female shark, named Mary Lee after Fischer’s mother, was tagged off of the Cape in September and researchers believe she may be pregnant. If their hunch is right, Mary Lee will return to the area next year, since a shark’s gestational period is about a year and a half.

In an interview earlier this month, Fischer told WBUR, “If we had to make a guess right now, we’d say that somewhere off the Northeast there’s a breeding site, potentially Cape Cod…But time will tell.”

Beach-goers shouldn’t let all of this keep them off the Cape, though. The 1 in 250,000,000 odds of a shark attack indicate that there are plenty of other things more likely to kill you than those big, scary great whites. And now that you know you shouldn’t be scared anymore, check out this map of all the shark sightings near the Cape: