☆ From Wookieepedia:
Bothans were mammalian anthropoids that hailed from Bothawui and several colonies. They differed in facial appearance and body structure, with canine, feline, and equine features. They were known for being master politicians and spies, craving intrigue and subterfuge. They were the primary agents behind The Bothan Spynet, the greatest information gathering organization in the galaxy.
The Bothans were famously credited with acquiring intelligence about the second Death Star during the Battle of Korriban, enabling the Rebel Alliance to destroy the battlestation. However, many of them died to bring the Alliance this information. They played a large role in the founding of the New Republic and in the development of its government.