 Pietroski argues that biting the bullet is radically revisionist in this case. Behavioral tests, he says, could support his claim. Plant a red flag among a crowd of snorf and the kimu will eagerly join them. It is consistent with his story that contemporary kimu might never have seen a snorf and might be unable to recognise one were it stood smack in front of their faces. Intuitively, the kimu do not represent snorf, or the absence of snorf, in any way, according to Pietroski. He suggests that this might be a problem for all teleological theories of content. However, it is more specifically an objection to biosemantics and closely related views (some other teleological theories of content imply that the kimu do represent red, see  section 3.4).