We have a self-filling watering station for our cat. It has a jug that empties into a water dish. It stays full for weeks at a time. I recently decided to dump the last bit of water and change it. I dumped the water into the bathtub. I noticed some odd "stuff" in the water. When I looked closely, the "stuff" was moving. When I looked even more closely, the "stuff" appeared to be some sort of insect larvae. Our dog took sick recently, and I was worried that it was some sort of parasite, so I decide to photograph the larvae. I posted the image to bugguide.net, were somebody told me that it was mosquito larvae, as I thought it might be. On the one hand, this is reassuring, since they are not harmful to ingest. On the other hand, it's more than a little disgusting. Here is an image of a whole larva: (click the image for a larger version with EXIF data) A closeup of the tail: And of the head: These larvae are tiny. I estimate the whole thing is about 3 mm long. I shot it with my Tamron 90, plus all 3 of my Kenko tubes, totaling 68 mm. That combo gives a little more than 2:1 magnification, if my measurements are correct. I lit the image with a pop-up diffuser attached to the front of the lens. C/C welcome, as always.