Unknown.
worms
Oak trees
Yes they are simply small
No: Short-eared Owls, as well as every other owl, are in the phylum Chordata. This means that they do have a backbone, which invertebrates lack.
they smell them
Screech Owls, Great Horned Owls, Barred Owls mainly.
recycling and cleaning up parks.
yes because they eat mice , woodrats, muskrat , and voles
Great Horned owls, barred owls, eastern screech owls, northern saw-whet owls, barn owls,short eard owls and long eared owls.
The owls that live in Illinois are: eastern screetch owl, barred owl, great horned owl, lone-eared owl, snowy owl, northern hawk owl, and short-eared owl.
Open country with interspersed forests, preferably evergreens.