PROVINCETOWN (CBS) – Dozens of endangered whales are taking up residence in Cape Cod Bay.

On Thursday, environmental officials spotted close to 30 right whales, just 500 yards off the coast of Provincetown.

Officials are planning an aerial survey in the next few days to get a more accurate number.

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Right whales typically show up every spring in the waters off of Cape Cod to feed.

The state has issued a warning for boaters in the area to use extreme caution.

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It’s against the law for boaters to approach within 500 yards of a right whale.

The Right Whale is the most endangered in the North Atlantic.

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Only about 450 remain in the entire ocean.