Peanuts?
Barley?
Corn?
Sunflower seeds?
Would love your input
Nut & Berry bird food from Walmart (Pennington brand $8-19) works the very best for me. Ya they like whole peanuts ok and will gladly grab a couple and run. Seems they all like the Nut & Berry, but especially the Pregnant females and/or adolescents, they really prefer the nut&berry. Munching, sitting pretty and predictable, right there at the bait station.
I assume you're asking what bait to use that attracts them best
and gives you the best shot at your bait station. This is my take after decades of pesting...
Most squirrels see a peanut and grab it then run. They might for a second or 2 move the peanut around in their mouth before taking off to a distant obscured branch, a ''safer' feeling spot to munch the whole peanut . Not great for a good head shot. As not many nutters will hang right there at your bait station feeling safe/eating whole peanuts. BUT, A pile of nut&berry they just can't leave alone. Eating each individual seed/nut/berry in the exact same position not even moving their head till its time for another mouthful to munch. Yup they sit there at your perfect predetermined distance in exactly the spot you choose for your best most humane head shot... and if you go back at dusk, any rats in the area will be there ready for a 18g.
So to me, whole peanuts while a favorite squirrel food, not so good for a pesting bait station. Nut & Berry bird food its like potato chips or pistachios to us. Actually pistachios are in Nut&Berry mix as is black sunflower seeds... A little noise that would normally spook them,, they don't even hear when munching on nut & berry mix....
If you really want to attract them from the whole surrounding area, set up a bird feeder every morning with the same mix with some trees close by. If you're lucky, first thing in the morning a bird feeding frenzy with birds flying all around, and fighting for position squawking away at the feeder is like the call of the wild for nutters, they follow the birds like the pied piper....
Suppose if you're trying to raise herds of nutters, the vitamins and minerals added to Nut&Berry mix for the birds might help the health of your nutters. Mine are big and fat since using the mix for the last couple years, and multiply like crazy. Seems no matter how many I take out a new crew appears immediately .....
jmo