I planted some corn seed a few weeks ago and they began to germinate lately. Then this evening, I found almost all of them got dug out!
The germinated seed are mostly left near the holes, but some of them are gone and there's no visible worm damage on the seed.
Maybe it's the birds, but the holes are about 3 by 3 inches and 1 to 2 inches deep.
What dug them up also knew exactly where they are. I planted them 16 inches apart and almost all of them got dug up at exactly where the seeds are. And I live in the rainy part of the US Pacific Northwest.