Sources : Coredulus

Isidore of Seville [7th century CE] (Etymologies, Book 12, 7:34): The coredulus is a type of bird, as if the name were cor edens [literally “eater of the heart”]. - [Barney, Lewis, et. al. translation]

Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Birds 5.35): The coredulus is a bird, as Isidore says, which is said to be a 'heart-eater'. For it lives on flesh and on prey, and is satisfied most of all with the heart. - [Badke translation/paraphrase]