General Animalistic Behavior

An animal can count only up to 4, (the number of their legs)
Every number beyond 4 is "Thousand"

Of course fractals and negatives numbers cannot even be fanthomed by animals
this also may also include the number 0 as an number (not as concept)

This is not an hard rule, but most tactics that deal with numbers may be used with this limitation in mind

two non-human animal that don't speak the same Language, can exchange simple information with what is called "Language of the Hedgerow"
Generally every Mammal, Avian or Reptile know this Language with the only exception being Humans. Deceiving or making opponents change ideas with only this language as an option may be really difficult