Journaling Question Discussion
Why is a 3-gram chunk of clay so tiny compared to a hummingbird that weighs the exact same?
Clay is dense, with little air inside. Hummingbird muscles are almost as dense as clay, but their bodies also contain large air sacs and hollow bones, and are covered with a relatively thick layer of feathers, which are feather light. So a hummingbird body has far less density than a piece of clay. That may be why hummingbirds have an easy time flying but when people are slow and sluggish and even have trouble walking, we say they have "feet of clay."