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Cheryl is a fellow paleontologist who Ross goes on a few dates with. She is portrayed by Rebecca Romijn.
Cheryl is a girl who dates Ross in season 4. She has a really messy apartment, which she never cleans up and where she keeps a hamster. It's also inhabited by rats. They break up because Ross can't stand being in her apartment.
At the end of the episode, after breaking up with Ross, Cheryl is bemused when Monica turns up with cleaning equipment and asks if she can clean the apartment for her, stating that when Ross told her about the mess, she "couldn't sleep thinking about it", leading a disgusted Cheryl to close the door on her.