Inside a Hummingbird's Nest (Day 12) The babies have filled up the nest and opened their eyes! Did you see the new green feathers starting to grow? What else has turned green? Can you guess why? (The green lichens on the nest are alive and related to plants. Ask your teacher about them.) It's hard to see, but the nest has gotten bigger along with the babies. Why? The spider silk in the nest very stretchy! (It's strong, too.) This Season Teachers Kids Orientation Registration Search Copyright 1997-2008 Journey North. All Rights Reserved. Questions or comments? Contact us.