Caroline, it's fun to be out in the garden to observe ants carrying off Epimedium seeds. When I clean & sow epimedium seed outside on a little folding table, ants will come up onto the table and try to steal some seed, lol. I've attempted snapping a photo of ants carrying away seed, but my point-&-shoot camera is not good for macro photography.
Chipmunks love the seed of Jeffersonia, Epimedium, woodland Iris and others. When I sow a flat, I must cover it with wire mesh right away; I remember one day after sowing a flat of Epimedium, leaving it on my folding table while I went inside the house for a few minutes, when I returned the flat was totally dug up.