Why not a hummingbird?
Their native range covers most of the Americas. Hummingbirds are
very difficult to keep in captivity, and so only a small number of
zoos in the UK keep them.
Those that are kept, tend to be the larger, easier species. The
smallest hummingbird in the world is the bee hummingbird of Cuba,
and even this little jewel is significantly larger than the
hummingbird hawk moth.
It has rarely been found even on the neighbouring islands, and
so could never stray across the Atlantic. It has proved to be too
difficult to keep in captivity.