The summer update notification gives incorrect information for Monstrologist Burke locations. The update notes say, "You can purchase the extraction spells from Monstrologist Burke in Azteca for Dinos, Monstrologist Burke in Grizzleheim for Draconians, and Monstrologist Burke in Zafaria for Insects."
The Azteca part is correct, but the Extract Draconians can be purchased from Burke in Dragonspyre, and the Extract Insects can be purchased from Burke in Khrysalis (in the Silent Market). I was excited that we were told where Burke would be, so I was a little disappointed when that didn't pan out. But I think these locations make more sense for these spells anyway