The tag implication #47718 non-mammal_anus -> anus has been rejected.

Reason: A mammal anus on a non-mammal creature is the anus on the creature.

EDIT: The tag implication non-mammal_anus -> anus (forum #351781) has been rejected by @Cow_of_Fire.

I feel this should be an alias. The non-mammal_x tags exist because non-mammals don't have x. There are certainly some non-mammals that don't have anuses (avians and reptiles have a cloaca instead), but I'm not sure that's broadly true of non-mammals.