I use the .17HMR Sportster. We have tiny Red Squirrels that are too small to eat. Guess you could take a bunch of them and make a stew, but they are the size of Chipmunks.
I was at my buddies house showing him my new .17 HMR. He has a problem with Red Squirrels getting to his bird feeder. He had refilled it and it was still sitting on the rail around his deck. A squirrel came up and was heading to the feeder. When it was 10 ft away Norm yelled for me to shoot it. too close to look thru the scope, I just pointed and fired. The tail was the only thing left intact.
The real reason Norm had the feeder on the deck for refilling was, he had came out and a squirrel was sitting on the feeder. It is the type that has two glass panels, angled in as they go down. leaving a small area for the birds to sit on. Squirrels like sitting there too. Norm shot the squirrel, and took out both panels of glass. He had to replace the glass.