You may choose to take a retrieve turn as long as you have at least 1 worker on the board or in your landing area (even if you have workers in your active pool).

When you take a retrieve turn, collect ALL your workers from the board and your landing area. Then, something happens for EACH collected worker depending on its strength:

STRENGTH 1, 2, OR 3: Collect income () from a different farm tile on your hive mat for each worker you retrieve (if you have more farm tiles than retrieved workers, some farm tiles will not generate income). Then, increase each worker’s strength by +1 and return it to your active pool.

STRENGTH 4: The worker must immediately hibernate.

Important: Any workers already in your active pool when you take a retrieve turn do not hibernate, gain strength, or gain income.