“Found these worms in the backyard and there are a lot!” exclaims this reader in his submission regarding the segmented, yellow worm-like critter pictured below. “I have a small garden there with an orange tree, but the garden is unattended. What are those? They seem to be active in the night and light attracts them I think.” Based on the excellent photo our reader sent in, as well as the helpful context, we would conclude that these are mealworms. Mealworms are the larval stage of the mealworm beetle, which is a species of darkling beetle. As our reader correctly stated, mealworms are nocturnal, and while they are not necessarily attracted to light, they can sense it.