Larvae of <i>Culex</i> Mosquitoes. As seen on the picture, larvae make dense groups in standing water. A shift in the feeding behavior of those mosquitoes helps explain the rising incidence of West Nile virus in North America. It appears that the darker structure at the top center of the image is one pupa.
(Image: James Gathany, CDC)
CC BY 2.5
<i>A New Model for Predicting Outbreaks of West Nile Virus.</i> Gross L, PLoS Biology Vol. 4/4/2006, e101. <a rel="nofollow" class="external free" href="https://dx.doi.org/10.1371/journal.pbio.0040101">https://dx.doi.org/10.1371/journal.pbio.0040101</a>. See also: Kilpatrick AM, Kramer LD, Jones MJ, Marra PP, Daszak P (2006) <i>West Nile Virus Epidemics in North America Are Driven by Shifts in Mosquito Feeding Behavior.</i> PLoS Biol 4(4): e82 <a href="//doi.org/10.1371/journal.pbio.0040082" class="extiw" title="doi:10.1371/journal.pbio.0040082">doi:10.1371/journal.pbio.0040082</a>