Given the task definition and input, reply with output. You are given a sentence and a question in the input. The information provided in the sentence should be enough to answer the question. You're expected to write the correct answer. Do not use any facts other than those provided in the sentence.

Sentence: As soon as they started to watch the monkeys, they started dancing by the window in front of Mike, Jane, and their mother. 
Question: What were the monkeys and the lions doing when Jane and Mike watched them?

dancing.