Many plants flowers are pollinated by very specific animals. For example, the Ohio Buckeye tree's flowers are pollinated by the Ruby-Throated Hummingbird and various long-tongued bees, including bumblebees (Bombus spp.), long-horned bees (Synhalonia spp.), mason bees (Osmia spp.), and Anthophorine bees (Anthophora spp.). These floral visitors seek primarily nectar, although some bees also collect pollen. This is why we need to rid properties of invasive plants and plant a wide range of native perennials, shrubs, and trees to help foster native pollinators. The part that most people don't get is over 50% of all the food that we humans consumed relies on some form of insect pollination.