I had a similar conversation recently with a friend on FB. I’d posted a really cool video of an owl where the handler was showing what narrow spaces they could fly through. The reward was a rat. My friend thought it was so cruel to feed “babies”. I explained that some raptors needed recognizable prey, much as my snakes do. There was no option for “chow” as it isn’t a recognizable food source. You can’t go againsts thousands of years of prey instinct.