This is a bird's nest in a tree in our backyard. There's one baby bird, just born, and 3 more eggs, waiting to hatch. At least I hope they'll hatch. My 7 year old found this and couldn't wait to show it to everyone, including the other kids in the neighborhood. I'm amazed at how large the first baby bird is compared to the eggs. We'll have to check tonight to see if the other eggs have hatched.
My advice is to walk around your house or neighborhood and check out trees for bird nests. You may find a few active ones with baby birds and/or eggs. Your kids will enjoy the experience!