I know this is quite the old thread, but I had a thought while reading: when taking steps to avoid undesirable trauma learning (hiding face, etc.), would it also be a good idea to trap a bird using an atypical prey item or a prey item you don't intend to hunt? For example, if trapping a kessie to hunt sparrows and starlings, using rodents or insects to do the trapping. I would think a bird trapped on sparrows would develop an aversion to them.

Taking the idea another step forward ,would it be a good idea to trap with something you don't want the bird to hunt? Again, using a kessie as an example, would trapping on a pile of grasshoppers create an aversion to them, and therefore increase the odds that the bird would focus on other prey items?

Has anyone experimented with this?