Here is a good site, in case you haven’t been yet: http://www.guildwars2-pets.com/index.html
And I realized after looking at it that it says both of those locations for the owl so I guess it’s not much help there lol. But I logged in and went to the Owl’s Abattoir waypoint and there were about 4 of them directly next to it. Not sure what’s going on.