Source : Webster's Revised Unabridged Dictionary (1913)

Zoological \Zo`["o]*log"ic*al\, a. [Cf. F. zoologique.]
   Of or pertaining to zo["o]logy, or the science of animals.

Source : WordNet®

zoological
     adj 1: concerning the study of animals and their classification and
            properties; "zoological research"
     2: of or relating to animals or animal groups; "zoological
        garden"