EVERETT, WASH. -- An Arctic ribbon seal rarely seen in Puget Sound has had its southerly sojourn interrupted for a medical checkup that shows the male is in good health.

Marine mammal experts from NOAA fisheries in Seattle threw a net over the white-ringed seal on an Everett dock Tuesday and held him for a 20-minute examination.

The 185-pound adult male is believed to be the same ribbon seal that was seen recently in the Seattle area.

Researchers are unsure why it's so far from its home waters off Alaska and Russia.

NOAA's Kristin Wilkinson told The Daily Herald the seal might have been caught in a storm or it might have been chasing food. She said a lot of shrimp are in Puget Sound right now.