Science of Eggs; the Shortest "ology"

This page is the CodyCross answer for the clue below from Forms of Communication, Group 2221, Puzzle 4 (Petroglyphs).

Question is: Science of Eggs; the Shortest "ology"

and the answer is: OOLOGY

Word Meaning:

OOLOGY — (ornithology) The study of birds' eggs.

Definitions from Wiktionary.