I am taking today off work and between chores have been sitting with the chickens. I noticed something interesting which is they know the alarm calls of wild birds.
I have lots of noisy wild birds and they ignore them. But one small bird flew by making a cry and the Princesses all dived for cover in the Chicken Palace and sure enough, hot on the tail of the little bird was a huge hawk. It was really like the little bird was warning the chickens.
That felt rather fanciful and the hawk went for a mouse in the meadow and so everyone (including me) relaxed and I thought no more of it.
A few hours later the mocking birds started screeching (they are always quite noisy) and again the Princesses ran straight into the Palace. And sure enough a fox appeared being mobbed by the mocking birds.
Meanwhile they completely ignore all the yells coming from the crows.
Seems like there is a shared avian language.