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"He's back and he's much more aggressive," cyclist Mack Temple said. "He came in from behind and whacked me on the top of my helmet -- he's apparently getting bolder."
Lynn Tompkins, executive director of Blue Mountain Wildlife, said the birds are likely Swainson's hawks.
"They are really territorial," she said of Swainson's hawks. "They have a reputation for being aggressive."
Carl Scheeler, wildlife biologist for the Confederated Tribes of the Umatilla Indian Reservation, said the hawks usually incubate for 28-35 days and begin leaving the nest about a month later.
"Typically, the more investment they have in their young, the more likely they are to be aggressive," Scheeler said.