The term glomerulonephritis (GN) covers a group of conditions in which there is injury in the glomerulus, the filtering unit of the kidney. This can occur either as a primary glomerular disease, or secondary to drugs, infections or tumours (see Secondary Glomerular Disease, pp 464â466 of this issue).
As insects are spiders' main prey, it is likely that they would impose strong selectional forces on the foraging behavior of spiders. Most commonly found in the sheet-web spider families, some webs will have loose, irregular tangles of silk above them.
The dietary habits of spiders are largely determined by the numbers and kinds of potential prey that happen to be in their vicinity. Unlike humans they do not require three meals a day every day. Instead, they are opportunistic eaters and will feed on as many insects as they can catch in one short period of time.