An outgoing forager doesn't go out unless it gets enough interactions with returning foragers, and what you see are the returning foragers going into the tunnel, into the nest, and meeting outgoing foragers on their way out.
Uma formiga só sai à procura de comida depois de ter interações  com as formigas que voltam. Vemos aqui as formigas que regressam, a ir para o túnel, para o formigueiro, e a encontrar as formigas que saem.