Incidents of letter carrier being attacked by household pets may not be so rare, but conflict with a squirrel may sound a bit offbeat. Barb Dougherty, a 30-year-old Postal Service employee, said she was attacked and bitten Monday by a squirrel while delivering mail in Oil City, about 75 miles north of Pittsburgh.

An opera singer riding his bike to a rehearsal of a new opera last month ended up in a hospital instead of the Helsinki Opera House after a squirrel jumped into his bicycle spokes. Esa Ruuttunen suffered a concussion and a broken nose from the accident. The squirrel did not survive.

A Finnish opera singer misses rehearsal after a squirrel runs into his bicycle wheel, causing him to fall and break his nose. Esa Ruuttunen was on his way to the Helsinki Opera House when the squirrel ran into his spokes. He was knocked out and ended up with a concussion.

At least 12 cheeky squirrel monkeys escaped London Zoo by scaling trees and leaping into Regent's Park. The Sun reports zoo keepers could only watch as the animals swung back and forth between the park and the zoo.