Butterfly encounter

A few weeks ago I went to a "Butterfly Encounter" at the Lilly nature center. They have 55 acres of prairie and woods. We saw lots of butterflies (though not as many as they have seen on warmer, sunnier days) but they are too hard to photograph. However, this monarch caterpillar sat still on its milkweed and I took its picture. It is probably a very hungry caterpillar.