Honey bee on pussy willow catkin (Photo: Susan Carpenter/UW–Madison Arboretum)
Andrena bee on pear blossoms (Photo: Susan Day/UW–Madison Arboretum)
Brown-belted bumble bee (Bombus griseocollis) on creeping charlie (Photo: Susan Carpenter/UW–Madison Arboretum)
Rusty-patched bumble bee (Bombus affinis) on New England aster (Photo: Susan Carpenter/UW–Madison Arboretum)
Syrphid fly on coreopsis (Photo: Molly Fifleld Murray/UW–Madison Arboretum)
Monarch on red milkweed (Photo: Molly Fifield Murray/UW–Madison Arboretum)
Great black wasp on mountain mint (Photo: Susan Day/UW–Madison Arboretum)
Common eastern bumble bees (Bombus impatiens) on goldenrod (Photo: Susan Carpenter/UW–Madison Arboretum)
Swallowtail on silphium (Photo: Molly Fifield Murray/UW–Madison Arboretum)
Viceroy on prairie clover (Photo: Molly Fifield Murray/UW–Madison Arboretum)