Next time you need an ice-breaker…

Last night at supper, the following conversation took place:
Colin: Do other animals fart?
Me: Yes.
Colin: Do only animals fart?
Me: Yes.
Colin: What kind of things are not animals?
Me: Well, plants, rocks…
Colin: But are spiders animals?
Me: Yes…
Colin: So spiders fart, right?
spider.bmp Well?