This is a great idea!

Make a Bird Feeder

This is another startlingly simple idea. To make toilet paper tube bird feeders, all you’ll need to do is cover the outside of the tube in peanut butter. Then, roll the tube in birdseed and slide it over a tree branch. This makes a wonderful, rich treat for wintertime birds, but it will also bring birds to your backyard in the summer, too.

Here's a link from Farmer's Almanac with a few other things you can do with those empty TP rolls.

https://www.farmersalmanac.com/7-creative-ways-to-reuse-toilet-paper-tubes-24484

**  You can also take a paper towel roll, cut it in half, and do the same thing.  It's a two-fer!