The average human, by comparison, can only hold theirs for 30 to 90 seconds.

Toilets include a U-bend pipe design, which serves as a barrier between the fixture and the sewers.

The bend has an air pocket, which rats can utilise when they swim up from the sewer.

They can compress their anatomy to fit through these tight spaces, ultimately giving them one-way access from sewer to house.

Rats usually comb sewers in search of food and are happy to eat almost anything.