Who is responsible for picking up a dead rat in NYC? The biggest rat I ever saw was a dead one on William St and as an alien I wasn’t really sure what the protocol was. No one else around paid any attention to it.
That would be DHMH[1] or Sanitation, maybe. You may be able to put a report in via 311, but I wouldn't count on a timely response (unless you count "a bigger rat eats the already big rat" as a response).
[1]: https://en.wikipedia.org/wiki/New_York_City_Department_of_He...