Bird That Appears on the Flag of Kiribati

This page is the CodyCross answer for the clue below from African grasslands, Group 1541, Puzzle 5 (Termite Mounds).

Question is: Bird That Appears on the Flag of Kiribati

and the answer is: FRIGATE

Word Meaning:

FRIGATE — (nautical) Any of several types of warship:

Definitions from Wiktionary.