Designing animals to survive on a planet with a low atmospheric pressure?

I'm trying to create a habitable planet but with a low atmospheric pressure, similar to Mars. But instead with 15 percent of Earth's atmospheric pressure, what traits can I give my animals so they have the best chances to survive? If the atmospheric composition is about the same as Earth and orbiting a star like the sun at the same distance, it also has only 51% of Earth's gravity. Also 60 percent of its surface is covered by water.

Density - 5.25 g/cm3, slightly higher than Venus.. Hopefully this unusually high density for a small terrestrial planet is enough to generate, at least, a weak magnetic field, similar to Mercury maybe!

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Designing animals to survive on a planet with a low atmospheric pressure?

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