Simplify the following text for a Grade 7 native English-speaking person.
Original: It mainly infects birds , but is known to infect humans , horses , dogs , cats , bats , chipmunks , skunks , squirrels , domestic rabbits , crocodiles and alligators .
Simplified: WNV mainly infects birds , but is known to infect humans , horses , dogs , bats , cats , etc.