Perhaps the best way to help wildlife this spring is to create a sanctuary for them in your own backyard. The Humane Society has a list of criteria that determines whether your yard qualifies as a wildlife sanctuary. A few of the requirements include providing a water source, skipping lawn chemicals, keeping cats inside and offering a variety of native flora.
Another way to make your green space more hospitable to wildlife is to reconsider cutting down trees in spring. It comes as no surprise that trees are incredibly important nest sites for all manners of birds (like this great horned owl mother and chick), but squirrels, raccoons and other critters also depend on them for sturdy den sites. If a tree must come down, it's crucial that it is thoroughly surveyed for any active dens or nests.