One thing about Spring in Michigan - SLUGS!! Lots of em! I guess they are around all the time - it's just that when we are cleaning out old leaves and stuff, there they are. My kids love to get a box and fill it with leaves and dirt and collect the little critters. They are kinda neat. Here is a fun fact about slugs I found when I was looking for the picture:

If you've watched a land snail or a slug moving across a dry surface, you may have noticed that it left a silvery trail. This trail is mucous the creature lays down beneath it as it travels. Land snails and slugs move upon a layer of mucous.
This mucous in wonderful stuff. For one thing, it prevents moisture in the animals' bodies from being soaked up by the dry terrain being traveled across. Also, it protects the animal's fleshy underparts from sharp objects. Snails and slugs can actually glide across the sharpest razor blade without cutting themselves.
The big danger in the lives of land snails and slugs is drying out. Gardeners know that one way to rid themselves of lettuce-eating snails and slugs is to sprinkle them with salt. The salt causes water to leave their bodies, and they shrivel up fast! xoxo A.Joy