Definition: In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.
Input: Sentence 1:Big cats that hunt nocturnally , such as lions , leopards and tigers , had never been extensively filmed doing so before . Sentence 2:But the latest infrared technology revealed behaviour that had previously been guessed at from evidence discovered the next day .
Output:
but