'(Sofia of the Clue Crew at the Field Museum in Chicago)  Earthworms, like birds, have this portion of the digestive system; they use it to grind up the earth they swallow'
gizzard
UNDERGROUND: Earthworms, like birds, have this portion of the digestive system; they use it to grind up the earth they swallow
Earthworms, like birds, have this portion of the digestive system; they use it to grind up the earth they swallow
Earthworms, like birds, have this portion of the digestive system; they use it to grind up the earth they swallow
UNDERGROUND
gizzard
UNDERGROUND