Robins are very territorial. I actually feed our squirrels, they are really fond of monkey nuts. We have a hedgehog house and put food out all the time. It is generally occupied over winter. We have robins, blue tits, doves, , black birds, pigeons and lots of starlings. When it comes to birds squabbling nothing beats starlings.
I ordered those peanut butter jars, but not from Q. Ordered then from a local company Monday, came Wednesday. Haven't seen any rats though. Mind you, I guess having 4 cats help.