Must be quite intensive keeping them?
It is actually the world's most peaceful feeling. At least for me.
I used to sleep with my bird in the night (the bird slept on me, laying down), and the bird could sit all day on my arm during the day.
You can teach a Harris's hawk to fly to your arm by calling him/her by whistling during feeding in 3-4 weeks.
After that time you call him/her to your arm without feeding.
He/she will know that you are calling him/her, and he/she will fly to your arm.
I used to fed her both with hands and on my arm.
When I came home, she often flied to my arm without calling.
She was very happy, when I came home.
At first, they need to be fed three times a day.
When they grow up, it is enough to feed them once a day.
I fed her mostly pigeons and chickens.
Harris's hawks are very smart and fast learners.
And they can love you very strongly.
That's pretty impressive! Could do with one patrolling my garden just to keep the wood pigeons at bay!
I found that with a good pet/animal that it can be ones of the most relaxing things. I am sure there have been studies on it