I was filling the hummingbird feeder, this evening, when my husband
joked that I should make the nectar with artificial sweetener. This
started me wondering; can hummingbirds really not tell the difference,
using clues like taste, viscosity, etc.? It seems like they should be
sensitive to such things. Humans claim to be able to tell the
difference between sugar and sweetener, and even between types of
sweetener.

Rachel Lawson
Seattle
RachelLawson at softhome.net