The melodious whistles of the Eastern Meadowlark is a familiar and welcome sound across farms and grasslands in eastern North America.
They will sing to stake out a breeding territory. A male Eastern Meadowlark typically has two mates at a time, and on rare occasion, three. I found this one singing in Goose Lake Prairie State Park.
I found this one singing at McKinley Woods/Moose Island.
Meadowlarks have a complex bill musculature that allows them to force the bill open with considerable strength. This allows them to insert the bill into the dirt substance, & pry apart the ground. While this happens the eyes rotate forward slightly and they can see directly between their jaws into the hole they have created. This technique is referred to as "gaping".
Gaping allows meadowlarks to seek insects that other bird species can't get. Starlings also have this ability.