At the time of reporting, there is no service between Waterloo and Stanmore on the Jubilee line while work takes place to remove the animal today (November 27).
There are also severe delays on the rest of the line.
The Metropolitan line is also facing severe delays due to the same incident.
Transport for London (TfL) first noted the issue just before 1.30pm today, with services still being impacted an hour later.
There is no indication on what animal this is and when both the Jubilee and Metropolitan line will return to normal.
