The Arc/Birds

Birds of the Arc is an activity in the Arc. Players can try to find all of the birds listed in the Arc Journal Birds pages. There are two descriptions for each bird - one before sighting it and a different description after it has been found.

Players can get hints about bird locations from Odd Billy on Cyclosis.

Some birds appear on certain islands at certain times while others are drawn by player activities such as skilling. Birds are not instanced. A larger gathering of players increases the chance of a bird spawning. All skill-related birds can be spawned on the main Arc islands and on uncharted isles, by participating in the corresponding activities.

Island specific birds spawn every 30 minutes, for around ten minutes, starting on the hour and are synchronised across worlds. On some occasions they have been noted to spawn for as little as 2 minutes.

Rewards
Speak to Odd Billy after spotting all the birds and he will reward you with a pet bird called Iago.

Also, the player gets a Completion Stamp on the home page of their journal.