Nah, it's to do with BBCode. Edit the links so that they end with ".jpg", i.e. chop off the "?v=0" bit and I promise you they'll work fine.
That one with the baby alligator and the turtle just lounging together is pretty insane! I think you pick some good subjects but I'm competely untrained, so no suggestions on the technicalities.
Edit: Oops, I posted while Hat was posting... I forget the cool jargon for that.