Birds use their tongues for a variety of functions also. Not only are tongues used to drink, but also to hold, pierce and tear food. Small stones and grit picked up with food remain in the gizzard grinding it for digestion. The gizzard is made of extremely strong muscles which in the wood duck can break down a whole acorn and in the canvasback duck grind fingernail clams for digestion. Birds have a high metabolic rate and, to survive, must eat large quantities of food frequently.
Small birds eat large amounts of food in proportion to their size.
Most birds must continually search for food. Only a few birds such as owls, crows and nuthatches store food for future use. At each station you will need three different tools. Divide the group into eight teams and have them rotate around the stations. From the three tools at each station the group is to decide which is most efficient for the specific food type.