Do mosquitos excrete blood?

Question

Since insects like mosquitos ingest only blood, and insects generally excrete their solid and liquid waste [at the same time](https://www.youtube.com/watch?v=6a8psEYgopw) as [frass](https://en.wikipedia.org/wiki/Frass), I was wondering: **is mosquito defecation more like iron pellets or droplets of blood?** I've never seen a mosquito defecate, so I have no evidence. Do they defecate during flight? If so, are tiny little droplets of digested-blood falling from the sky?

Answer 1

Interesting question. I can't give an exact answer, but from my experience working on bugs in my lab, they'll probably excrete when they land. I haven't had an experience where the bugs excreted mid flight/jump (I work on milkweed bugs which don't really fly). Since they're mosquitos, they probably excrete the remnants of the digested blood.