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Yes, humans carry fleas. Although fleas are primarily associated with dogs and cats, they are attracted to the warmth and carbon dioxide of mammals, including humans. The difference is that most fleas will only choose animals as their hosts. They may bite humans, but they don’t tend to stick around on humans for long. The one exception is the Pulex irritans, also called the human flea, which prefers human blood.

You’re not likely to find water bugs in your house. They may accidentally come in an open door when flying, especially since they are attracted to lights. But water bugs tend to stay stationary in bodies of water. You’re much more likely to see a roach in your home, not a water bug.

Like many other rodents, squirrels can be a little difficult to get rid of (especially in the case of an infestation), but the best approach is to make the place as unattractive to squirrels as possible. If you do have an infestation inside your home, then professional help may be necessary so you can lay as many traps as possible. 

It may be better to have a mouse in your house than a rat. Rats are larger, more aggressive, and more difficult to eradicate once settled. One rat can cause more damage than one mouse. However, both animals pose a danger in that they can spread bacteria and contaminate food, so you’ll want to contact an exterminator as soon as you detect an infestation of either animal.