This seems to refer to the shop and the owner who uses primarily recon hawks for messaging, recon, spying, and weapons. The sing says there are a variety of other creatures such as Pigeons, Bugs, butterflies, and more.
D encounters the shop and owner when he is in Ligatem, where he wants to buy a recon hawk to spy on the Xeno Clan. But negotiation for the price go bad when the owner attempts to gouge D for money than he should which ends with the tip of his nose being cut off. He doesn't end up doing business with him once Pikk comes in and lets D know the whole town is in on the joke where they gouge their prices and uses dishonest business practices.