The outworld is a room you link on.

Food and trash stay out of the nest. The nest stays damp and dark, and you feed through the outworld lid instead of opening the nest.

Each outworld has a feeding port in its lid.

The Frontier S, $34, is sized to pair with the Founder. It comes with a Link and its own Port Plugs.

The Frontier L, $52, is sized to pair with the Homestead. It also comes with a Link and its own Port Plugs.

Both sizes are on the same shop page.

Both Frontiers have their ports at the same height as the Founder, Homestead and Four Corners. They join straight across on a flat surface.

The Scout sits lower, so it uses a Scout Riser. The moving guide shows the join.

Any port you do not use needs a plug. Do not leave an opening that ants can walk out of. Check each port before you add ants.

Not on day one. Start with the tube and the Scout, then add a nest, then an outworld. The size guide shows the order.

See the whole range on the formicarium page, or begin at Start here.