Black Caterpillar in My Flower Pot

In the past few weeks my time was confiscated on campus in the morning - in the morning before dusk, so that some of my flower pots did not get me to take care of the results when yesterday's holiday really surprised me some of my flower pots had been eaten by caterpillars, I saw the black caterpillar that sleeps again in my flower pot that has run out of green leaves only leaves a few flowers. This flower is originally pink with its dense green leaves all finished eating with horned black caterpillars like the picture below.