Nectar is nectar wherever its found...

Photo by Barry Wallace

Pictured above is a Mourning Cloak butterfly getting nectar from one of our hummingbird feeders.   This also happens occasionally with other types of butterflies.   It's the middle of July now and this Mourning Cloak is showing some wear and tear on the hind edge of its wings.   They live for almost a year in suitable climates in North America and Eurasia.  They also go by many local names.
Please comment if you wish.
BarrytheBirder