Vetafarm Avian Crittacare 450g Published March 2, 2017 at 600 × 600 in Vetafarm Avian Crittacare 450g Vetafarm Crittacare Avian 450g. Critta Care Avian should be used whenever any bird is not eating voluntarily. It will aid in the recovery of sick or injured birds and should be fed until the bird has resumed normal feeding.