The nightmare of every subway rider was caught on video after a chubby sewer rat crawled up the leg of a sleeping straphanger on a No. 4 train in Brooklyn and came face-to-face with the man.

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Video: Stand clear of the claws-ing doors! Shocking moment a woman's pet rat crawls into her shirt on a New York subway as another rodent sits on the back of her friend's neck Woman's 'pet rat ...

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Subway Creatures and WhatIsNewYork, the fascinating Instagram accounts that document all the wonderfully unique things that ...

Neuroscientists taught rats to drive cars (yes, really) and learned something surprising about how humans can improve their ...

The idea is users can report how many rats they see at their local subway station, and the app compiles findings to give each station a rat ranking, according to a blog post from the app.