Western meadowlark
The western meadowlark is the state bird of six states: Montana, Kansas, Nebraska, North Dakota, Oregon, and Wyoming. The northern cardinal, which represents seven states, is the only bird to hold the status of state bird in more states.
Chickadee
The Chickadee (specifically the black-capped chickadee "Poecile atricapillus" formerly "Parus atricapillus") is the official bird for the states of Massachusetts and Maine.