The long needle-like extension on the tip of the abdomen is the ovipositor, or egg-laying structure of this female parasitoid wasp. I watched her thrust the ovipositor down into the centre of the native daisy multiple times. This type of behaviour suggests she was laying eggs inside a host, probably some type of arthropod living concealed inside the disc florets. It serves as a reminder that in gardens and habitats with a diversity of native plants, tri-trophic interactions are more likely to occur because most native insects depend on native plants for survival (plant is native oxeye sunflower: "Heliopsis helianthoides", family Asteraceae).
Caterpillars themselves are not pollinators, but they grow up to be pollinators. Most cats* feed on fresh green leaves of their food plants, and many are highly specialized on native species. If you want beautiful moths and butterflies flying around your garden, you'll want to plant the food plants of the caterpillars. You'll need to plant native species. Caterpillars are fascinating animals in their own right, and a major food source for birds. Native plants attract the insects, insects attract the birds. This is what biodiversity gardening is all about. The image shows the defensive display of a papilionid. All papilionid cats have an osmeterium (forked red structure), or an everscible gland behind the head that emits a foul odor, warding off potential predators (Cat: Papilionidae: "Papilio cresphontes"; plant: Rutaceae: hop tree, "Ptelea trifoliata"). *those of us that love caterpillars refer to them as "cats" for short.
Virginia creeper is a member of the grape family, and one of the few native vines in Southern Ontario. It is often mistaken for poison-ivy, which has only 3 leaflets; Virginia creeper has five. A white-tailed deer lurks behind ("Parthenocissus quinquefolia": family Vitaceae).