Do great grey owls get eaten by horned owl?

No, great grey owls are not known to be preyed upon by horned owls. Great grey owls are generally much larger than horned owls, and they are also more powerful. In addition, great grey owls typically inhabit different habitats than horned owls, so they are less likely to come into contact with each other. However, there have been rare cases of horned owls killing great grey owls, but these are very uncommon.