Isn't that so funny? Spike does always go for the biggest worm in the dish and flings the smaller ones out of the dish behind him. It's like he needs to isolate his prey...one worm at a timePeople bought a LOT of pets and started a LOT of gardens last year. Can't figure out why... =DD
Just as many species of exotics are scarce, so too are their foods! Department store garden shops are ransacked as soon as they are restocked.
But I've known tiny turtles to go for the biggest worm on the plate, so it's probably an expense-vs-benefit type of situation. Bigger food items cost less to eat than a bunch of smaller ones.