In NE US, American Goldfinches are particularly fond of them.

As others said, gold finches love them. Thistle seed as a close second. House finches and sparrows will eat them too.

I will also say that how you feed them affects it too. Putting it in a hard feeder or tray is okay, but using a sock (the mesh tubes) will get you more birds.

Gold finch.

I'm not familiar with birds in your area but we get it for the finches. We have a lot of gold finches in particular. Spouse says they don't really like the feeder, but if it gets knocked over (starlings love to just toss shit around) they do eat it. We reduce feeling in the warmer months so we're reasonably certain it is getting eaten by someone, or else it would build up on the snow.

I have read that it goes rancid quickly due to the high fat content. Perhaps yours are picky?

Region: Southwest USA

As others have mentioned, gold finches seem to like it. I've had the occasional sparrow eat it off the tray at the base of the feeder that catches spilled seed. I think the towhees will eat it off the ground, but it's hard to tell if they're going for seed or bugs. Other frequent visitors ignore it, which include house finches, doves, and scrub jays. The bird seed cylinder on my other feeder gets 99% of the visiting bird traffic.

I have noticed that birds take a long time to figure out what a new feeder is, up to a month of it being out daily.

You can’t say that anymore