Deviation From the Rule, Form, Arrangement

This page is the CodyCross answer for the clue below from Fauna and Flora, Group 180, Puzzle 1 (Birds and Mammals).

Question is: Deviation From the Rule, Form, Arrangement

and the answer is: ANOMALY

Word Meaning:

ANOMALY — A deviation from a rule or from what is regarded as normal; an outlier.

Definitions from Wiktionary.