Not much to add to Big Dave's post except to note that the 'arc' is actually 'The Ark' which is basically the same as gallopers but you ride the animals that went into The Ark.

Whilst there's still a few sets of gallopers doing the rounds of the fairs there are, sadly, very few Arks left, and many of the gallopers have animals 'cannibalized' from older arks.