Noah's Ark 2.0

Here's an interesting question for you to ponder.  With humans possibly living on Mars within the century, starting small and growing our presence there, inevitably as we build an ecosystem we'll have to start bringing animals to Mars with us.  Bearing in mind only the animals we bring with us would exist on that planet you have an interesting position where you inherit the mantle of Noah.

Regardless of whether or not you believe the story of Noah and the Ark, the principle remains quite simple to understand.  In order to preserve the animal kingdom he selected 2 of every animal.  In reality if we were going to take animals to Mars we would likely need to bring more than 2 of each kind for a number of reasons but the most pressing being the fact they will die eventually and 2 alone is not that much secure in terms of preseving their species.  As for which animals you bring, that's what I want you to think about.  Would you bring every species of animal?  Is that even possible given the fact we continue to discover new species and classify them to this day.  Which animals are the most important and for what purpose would we bring them?  Food is perhaps the most obvious but there are other uses for animals depending on how far we can advance an ecosystem of our own design.

I am sure there are a few animals on Earth people have wanted to wipe out - I am not talking about cute and cuddly animals, I mean the annoying ones that people kill every day, mice, rats, flies, wasps etc.  Animals that for the most part are generally referred to as pests or vermin.  You have the opportunity to colonise a planet with the complete absence of those animals, and given the fact evolution takes a very long time, they would not evolve on Mars with our presence there.  So that brings us back to the main question.  If we were to gather animals to be placed inside an Ark to travel to Mars, what animals would you want to bring?