Carico,
Would you do me a favour and classify the species listed at the end of this post into three groups? You may group them any way you like, and give the groups any description you like, as long as you can give a reason for why you put each species into a certain group. And the only other condition is that no group may contain less than two species.
To give you an example of what I mean, here is a list of species:
salmon, wasp, tiger, snake, vulture, wolf, sparrow
and here is a possible grouping:
[salmon, snake]=animals without legs; [tiger, wolf]=furry animals; [wasp, vulture, sparrow]=flying animals
Here is another possibility:
[salmon, snake, wasp]=animals with cold blood; [tiger, wolf]=animals with four legs; [vulture, sparrow]=animals with feathers
Now you. Here are your species:
dog, horse, cow, human, pig, cat, gorilla
And please remember,
no group may contain less than two species.
Good luck.
{edited to change shark to salmon}
This message has been edited by Parasomnium, 27-Dec-2005 10:33 PM
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