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The primary attractant for moles is food. With a powerful sense of smell, they seek out grubs, earthworms, ants, and other insects in the soil. Other factors can also draw them in, such as moist, loose soil which makes tunneling easier, so an overwatered lawn can be an invitation. Additionally, male moles may enter your yard to expand their territory or find a mate, and if a neighbor has a mole problem, it's possible for them to tunnel over to your property.

Probably not. Many imitation nests are meant to be hung from trees or other tall places, but not all yellow jackets nest up high—most species, such as the common yellow jacket and the southern yellow jacket, build nests in the ground. 

Poison will kill small rodents and can seem like the quick and easy way to get rid of them. But—in addition to its inhumane nature—poison has some drawbacks. First of all, if you have small children or pets in the home, setting out poison isn't the best idea, as your pets or children could ingest it. 

Poisoned mice and rodents don't die instantly. Instead, it can take several days for the poison to work its way through their system. In the meantime, there's a chance that a predator, such as a cat, fox, or other mammal, will eat the poisoned rodent and become poisoned themselves.

Roaches may not be quite as common on the top floors of a home, but they can easily climb up there if they want to. Second stories are less likely to have food sources and somewhat less likely to have moisture issues, so most roaches are attracted to bottom levels first. However, humid attics and similar spots can help roaches thrive.