Hidden within this mosquito’s straw-like proboscis is a tube with a very sharp tip designed for piercing skin.
The blood of a human volunteer can be seen filling the abdomen of this mosquito, Armigeres subalbatus, as she feeds. (James Gathany, CDC; PD)
Mosquito larvae live in water (shown here: Culex sp. (James Gathany / CDC; CC BY 2.5)
Head of a long-legged fly (Family: Dolichopodinae). (Donald Jusa / Flickr; CC BY 2.0)