From Aloniverse

These creatures are a cross of zombies and birds. They eat brains and fingers to help them have energy. They are red feathers. These crow like zombee birds fly faster than any other bird. Which helps them go through the portals and hunt down they prey. Annoyingly for the Zurge intergalactic travel via the portals doesn't agree with them, if they are lucky enough not to get turned into a less lofty species (such as the maggot like muggle spawn ) they often die by literally vomiting until they explode.