The football sea squirt (Diazona violacea) species of small sea squirt which forms into colonies up to 30cm across. Most common in western Scotland and Ireland, although small, dispersed populations are present elsewhere in British waters. They are also found throughout the rest of Europe. This species of sea squirt does indeed look somewhat like a football, hence the name. The football sea squirt is a filter feeder which relies on consuming microscopic matter and food particles which float past on the tide.