In the contest between sparrow and kestrel, the kestrel mostly wins. But blue jays are a pretty even match. And while the kestrel has a formidable arsenal, the blue jay's bill makes it a potentially fatal adversary. Knowing this, these jays tried to move this kestrel off his kill. This bird eventually flew out to the southwest and I lost it somewhere over 104th St. The fact that it was bringing prey back to its nest is an interesting piece of info. Ill try to follow up on it.