The first time I saw them, I thought they were fleas because they can jump. But when I caught one and looked at it with a magnifying glass and later took a picture with my USB "microscope" (the close-up pictures and video I shared), I wasn't sure what it was.
I'm a biologist (a molecular biologist, so unfortunately I don't remember much about insects) so I'll try some of my colleagues first but I'm not sure any of them is an entomologist. Then I'll probably take your advice and take one to the museum. The animals are very difficult to catch and transport without inflicting severe damage. I'll try anyway.
If anyone can identify the creature, please don't hesitate even though I'll take it to the museum.
Thank you for the response.