DULUTH, Minn. - About 150 birders from 30 states are in northeast Minnesota this weekend for a bird festival and to see rare owls.

Duluth birding guide Dave Hendrickson is a founder of the Sax-Zim Bog Winter Birding Festival, which started Friday and runs through Sunday about 60 miles northwest of Duluth.

He tells Minnesota Public Radio News that every four years or so, droves of the 10-inch-tall boreal owls fly to Minnesota from Canada when the rodents they prey on drop in numbers. They usually feed along the North Shore of Lake Superior.

He says a lot of birders are probably causing traffic jams on Scenic 61. He says you know the location of the owls but looking for the crowds.

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