The mother cat purrs announcing that it is feeding time and her kittens reciprocate the act after about a week old,;maybe as a sign of gratitude.

• 哺乳期的猫通常会在哺乳前发出喉音来告知自己的孩子，它的孩子们在一周大的时候就会在进食以表演的形式来报答，这也许是表达感谢的一种方式。