You can overall ignore things that don't seem relevant, and just follow the rules. So "animals are telling the truth" doesn't mean non-animals are lying for example.
For a more clear answer (rot13):
"Navznyf ner gryyvat gur gehgu" vfa'g eryrinag ng svefg ohg pbzrf vagb cynl yngre. Vs fbzrguvat qbrfa'g znxr frafr lbh pna nffhzr vg'f hfrq yngre.
Nsgre gung, yvrf ner jung lbh'q rkcrpg V thrff, fb n yvne fnlvat "V'z ba ebj 1" zrnaf vg'f abg ba ebj 1.