Have you seen a large yellow butterfly flutter along forested edges of open areas? Over the last week and weekend a number of canadian tiger swallowtails have been spotted by observers. They emerge earlier in the season than the eastern tiger swallowtail and are both paler in color and smaller in size. In fact the caterpillars of both species feed on very different species of trees. If you have birches, aspens, and black cherry trees near you, you’ll be guaranteed to see canadian tigers. If you have tulip trees near you, then you are you’ll be guaranteed to see eastern tigers a little later in the season. So if you see one, please post it and be confident that it is a canadian rather than an eastern tiger swallowtail you are seeing. Canadian tiger swallowtails will lay eggs soon and adults will stop flying by July so enjoy them now!