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Tiny flea-like bug ID request...

I don't have a picture of this thing, it is tiny, about the size of a flea, and while it usually crawls, it will hop like a flea to evade an angry finger. However, it has antennae, and a long abdomen, with six legs, and no obvious biting mouthparts, pincers, claws, or other such characteristics of a louse or flea.

I am very perplexed, since I have found these on the floor of the bathroom where I keep my cat, and I think they may be biting her, since I've found tiny, thin spirals of dried blood in the sink where she sleeps very reminiscent of flea dirt. I haven't actually clearly seen this bug on her, nor have I found flea dirt on her, but I only see this bug where she spends a lot of her time (in the bathroom where her food and litterbox is located).

Any help is much appreciated, I'm sorry I don't have an image. It appeared to be wingless, but it does appear to have very small hairs on its thorax.

Springtails?
Your description sounds like springtails, which are completely harmless. The reason you see them in the bathroom is they're very sensitive to dryness and bathrooms tend to be moist.

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