Cygnoid

A 'cygnoid' is an alien creature that once featured in the episode of Futurama entitled A Leela Of Her Own

Part they played
They moved in to the pizza shop opposite Planet Express. When the employees from Planet Express go there to greet them, they try some of the pizza there. The Planet Express crew is disgusted at some of the ingredients used, so they decide to give them a few tips. During this, the crew find out that the 'cygnoids' don't know how to play Blernsball, so the crew challenges them to a game. During this, they discover that Leela has a tendancy to constantly throw the Blernsball at the players faces. A manager of a famous Blernsball team notices her, and employs her as a comedy act for his team. Later on, we see the family of 'Cygnoids' selling pizza at one of Leela's games. This is the last we ever see of them.