Difference is thought provoking...

Right here on earth there are creatures in some regions that differ greatly from those found in others...like the koala. One could almost imagine them coming to our tiny blue planet from somewhere else...

Others on the list:

Lemurs - Madagascar
Kangaroo - Australia
Komodo Dragon - Komodo islands
Llama - South America
Ostrich - South Africa
Platypus - Australia and Tasmania
Giant squid - Antarctic

Many others, and let us not forget that in the insect kingdom there are species that defy description...and our oceans remain an otherworld.