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what kind of worm?
Hi mkadir, - The "lesser" mealworm is not the same as the more commonly reared "yellow" mealworm,
although both are sometimes just refered to as "darkling" beetles. There are lots of on-line pictures & entomology descriptions using the scientific name you can find.
My impression is your videos are of "lesser" mealworm larvae (& possibly their adult beetles) because, unlike "yellow" mealworm larvae, they do move fast. This variety of larvae average 5.8 - 6.2 mm (approximately 1/4 inch) in length, making their size "less" than the "yellow" ones.
Yellow colored "hairs" cover the 2 feelers (antennae) of the "lesser" mealworm larvae. If you can get a magnified look at that it would help in identification.
There is a Forum thread "Are these lesser mwalworm beetles with my yellow mealworm larvae."
Thank you very much.