From Blue Kingdom Tours Facebook Whale watchers were quite surprised to witness a rare sight the other day. While on a whale-watching tour in Washington, they witnessed as a whale mistakenly swallows a seal.

It's a good thing seals aren't on a humpback whale's menu. A photograph by a whale-watching naturalist captured a seemingly bewildered seal in the mouth of a humpback whale after the giant marine mammal accidentally gulped it last Thursday in the waters off Anacortes,

Here's something you don't see every day: a seal in the mouth of a humpback whale.The incredibly rare event happened during a whale-watching tour.