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.
Although most of the 35,000 species of spiders eat insects, some have a more diverse diet. Most spiders will not hesitate to cannibalize one another. All spiders prefer live food and large species like tarantulas are powerful enough to take on small birds, lizards, frogs and millipedes.