From ANIMA
From running the Greek through a few translations, it sounds like these are the babies of unreleasable Eagle Owls. But the babies will get to go free after they have been properly raised by their parents, just as in the wild!
Greek Text
Για τον μήνα τον καλό σας έχουμε μπουφάκια ολόφρεσκα νέας εσοδείας (δικιάς μας), από μη απελευθερώσιμους γονείς στο Κέντρο Περίθαλψης, στα Καλύβια. Όπως και τα περσινά και τα προπέρσινα όταν έλθει η ώρα θα τοποθετηθούν σε κλωβό σταδιακής επανένταξης και θα αποδοθούν στη φύση.
Also a pair of unreleasable Barn Owls, with their babies, and a helpful uncle in the background as well!
Greek text
Και άλλη εγχώρια παραγωγή, τυτουδάκια στα Καλύβια, εδώ βοηθάει και ο θείος το ζευγάρι, όπως φαίνεται…
Why are they unreleasable?
I went back a few months and didn’t come across their particular stories. This group seems to treat a very high volume of patients.
Usually they are either unreleasable due to being imprinted in humans or have an injury which would make it difficult for them to feed themselves or stay safe, like permanent wing/eye/ear damage. Since these are able to properly raise owlets, I’m guessing it’s injury related as they still have proper owl behaviors.