Entomologists estimate that there are between 5 and 10 million species of insects on Earth. But when asked which insect they hate essentially the most, many people would have no hassle selecting just one -- the cockroach. There are many causes to dislike cockroaches. Their flattened our bodies, leathery wings, skittering legs and long, waving antennae give some people the creeps. Because roaches eat rubbish and waste, they'll spread micro organism like Salmonella and Shigella from place to put. As they stroll, they depart trails of fecal matter, which they use to seek out their approach round. On high of being gross, these trails can cause stains and odors. The proteins in cockroach saliva and waste may also cause allergies and aggravate asthma. One motive is because of their pure habits. They reproduce quickly and are exhausting to kill. Since they're nocturnal, many individuals don't discover their presence until there are so many that they've run out of locations to hide.