The first sure sign that spring is near is the squirrelly behaviors at the feeders. If you feed the squirrels and think they are looking especially fat right now, it may be that the females are eating for three or four. You can spot the experienced momma black squirrels because they look like they are running around with only their fluffy pants on. They pluck out the top half of their body hair to line their nest.
Another sign I've noticed is the increased activity at the finch feeders. American Goldfinches are the only finches in North America to go through a complete molt two times a year. In the spring the duller olive green wardrobe of the male is switched over to the bright yellow feathers with a stylish black cap and black and white wings. The spring molt requires a large amount of nutrients and energy which probably explains their ravenous behavior at the feeders right now.
Average dates for birds return to Michigan the in Spring? http://bit.ly/IMYNQe
When is bird migration over? http://bit.ly/IMZ7OQ
What birds migrate from Michigan? http://bit.ly/IMZsB3
What to know about feeding birds in the spring http://bit.ly/I5s6h9