I have noticed more tweets, chirps and bird songs falling from trees into my ears of late. I wonder how many 
species of birds actually migrate from Wisconsin in the autumn and then return in Spring. I came up with the following report from this Wisconsin site…
Statewide Birding Report as of April 17, 2008
Warmer temperatures and south winds have brought many new birds into Wisconsin over the last week. Forest migrants include hermit thrush, yellow-bellied sapsucker, kinglets, winter wren, fox sparrow and yellow-rumped warblers. American bitterns, sora and Virginia rails and other marsh species have returned to southern Wisconsin. The annual migration of tundra swans is well underway with large numbers of birds seen in flooded agricultural fields from Green Bay west and northwest to Burnett County. Breeding activity is also picking up for birders who like to watch displays of woodcock, prairie chickens, sharp-tailed grouse, cranes and other early breeders. Ruffed Grouse drumming has also begun in earnest now in many areas of the state. Northern Wisconsin birders are still reporting redpolls, evening grosbeaks, and a few lingering northern shrikes. Next week should bring the first push of early shorebirds and upland sandpipers, grasslands birds (Henslow’s sparrow), and more of the early forest migrants including blue-gray gnatcatcher, house wren and a few early warblers along with broad-winged hawks and short-eared owls. Please report bird sightings to eBird (www.ebird.org/WI) to help better track bird migration this spring.
Like Jesus, it is fun to “consider the birds of the air…” (Matthew 6:26)
Along with the above, I’ve also noted snow-birds returning, those of the Zion variety in particular. Hopfully we’ll hear their tweets and chirps tomorrow morning.