Squirrelicorns are a militaristic 'animal' that look like squirrels, but they have unicorn horns and wings. They cannot fly very long distances. 

Artimeans typically used Squirrelicorns for reconnaissance and short scouting flights to gather information. The leader of the Squirrelicorns, Rufus, is killed during the rescue mission on Warbler by Alex accidentally touching him while using the Dissipate spell.