Because the Michigan Audobon Society lobbied for it in 1931. The bird is very common in Michigan, and well known. It was passed as a House Resolution, not an actual law.
Three years later, it was discovered that the Kirtland's Warbler is unique to Michigan. It summers in Northern Michigan, and winters in the Bahamas. Sounds like a smart bird to me.
There is a push from the Michigan Audobon Society now to make the Kirtland Warbler the official state bird of Michigan.
Links:
http://en.wikipedia.org/wiki/Kirtland%27s_Warbler
http://www.netstate.com/states/symb/birds/mi_american_robin.htm
http://www.michiganaudubon.org/state_bird/state_bird.html
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The American Robin was adopted as the official Connecticut State Bird by the General Assembly in 1943. The white oak (Quercus alba) was adopted as the official Connecticut State Tree on April 16, 1947.
There are four states with the wild turkey as their state game bird. These states are: Alabama, Massachusetts, Oklahoma, and South Carolina.
The state of Delaware is the only state with the Blue Hen Chicken as its state bird.
The states that have named the wren as their state bird are South Carolina, Kentucky, and Missouri.
Yes, it is likely against the law to kill a state bird as many states have laws protecting their state birds from harm or harassment. Killing a state bird could result in fines or legal consequences.