Annie Mole's, webmaster of Going Underground, daily web log (blog).
If you like this you'll LURVE One Stop Short of Barking, THE fun and informative BOOK about travelling on the London Underground.
Aslefshrugged spotted these on the Central Line on Sunday "Are they deer or dogs? No idea but when I changed ends at WER today there was a whole car full of them. I love this city." There's more pictures on his blog.
It's not an isolated outbreak though. Lee Sankey said: "I was greeted by the following scene as I entered the last carriage on the Northern Line at Waterloo."
Like Aslefshrugged there's more pictures on Lee's post.
"How fantastic! Whoever you are, more please", Lee concluded. Yep more please!
Update - They've also been spotted on the District Line last week by James Weaver aka @Liquid City
He said "No one seems to be amused by the balloon animals in the carriage. There is no pleasing some people." It pleases me & all the other people who RT'd the post on Twitter. If you've seen any more let me know. Cheers!
"The magic, mystery & sometimes maddening shortcomings of London's Tube are documented with love, enthusiasm & sometimes despair by its unofficial social historian." The Guardian