Animals taking public transportation

Some domestic pets, feral animals and wild animals have learned to use human public transportation to travel independently.

This is tolerated or even celebrated by passengers, although most public transportation systems only allow service animals and forbid pets.

According to urban wildlife specialist Suzanne MacDonald, animal "commuters" are usually motivated by food and security available on the vehicle rather than its ability to take them to a destination.

[1] Examples of animals relying on public transportation for food or a secure environment include: Animals have been observed numerous times to ride public transport as a means to reach a desired destination:

A feral pigeon travelling on a carriage on the London Underground
A street dog on the Moscow Metro