Carpenter Bees / Woodpecker / something else?

So I just noticed these holes in the exterior of my cabin. They are barely less than 1/2" around. We've had carpenter bees and those holes IIRC are larger in diameter and show higher precision; so I'm leaning torward woodpecker. We know there are woodpeckers in the area (Midwest). However - I'm no expert - any thoughts on:

1. What caused these holes?

2. How to fix/repair these holes?

My only thought on repair is plugs & glue. Anything better?

https://preview.redd.it/plln56jtaa0e1.jpg?width=2252&format=pjpg&auto=webp&s=a061d77c013e425dd91856b4d754eff693d7af54

https://preview.redd.it/c3d8s95uaa0e1.jpg?width=2252&format=pjpg&auto=webp&s=7cd790f9ba28852ce28ff3130d0c5e177fe95caf

https://preview.redd.it/4fv7c3kuaa0e1.jpg?width=2252&format=pjpg&auto=webp&s=02d2de88a8e647b0599411f0aa8dae25acde7b6b

https://preview.redd.it/5kbj8l9vaa0e1.jpg?width=2252&format=pjpg&auto=webp&s=6548f4c14b28d0d587c494c51f4c38b9aa2deb0e

Thanks