Students will distinquish the major classifications of birds and the characteristics of related birds.
Scientists use keys to classify relationships of birds.
Keys list primitive birds first and the more advanced birds, requiring more steps to identify, later in the key. The major families of birds common to Illinois are listed below in order from the least to most advanced. Ducks, geese, swans - Birds in this family are common to wet areas and usually have webbed feet. The eggs of these birds are unspotted. Their feathers are modified to allow them to fly quietly and their eyes are adapted for ability to judge distances.