Burning Question

Why does the American Robin NEVER come to the backyard feeder, even before a storm, when the rules about who eats seeds are relaxed?  Is it because a good rain practically serves worms on a silver platter? Or are they just picky eaters, there being no worms or fruit at a seed feeder?  Or do they consider themselves tough enough to go out in a rainstorm?  They do have a sort of arrogant air about them, what with their stiff backs.

Even bluebirds, who have a similar diet, come to the feeder occasionally, and not only before a storm.  If anyone out there (Lisa, Mary, Hannah, Nicole?) knows why a robin never does, I'd be grateful to be enlightened. Many thanks, dkm.

p.s.  Let me not forget to express my gratitude to my big brother Dan for the gift of a bird feeder that is really and truly squirrel-proof.  It affords us hours of bird-watching pleasure, otherwise described as furious flipping through bird identification guides.  Even Moe.  So thanks, Danny Boy.  You have a knack for gifts that feed the soul, as well as the birds----and because I can't resist, duplicate books.  I'll take a second copy of this bird feeder anytime.  FYI,  the extra books have found a worthy place in my writing critique group's lending library.  :-)