3.6 X the mass of Earth would mean 3.6 times the gravity? Correct me If Im wrong.
If I weigh 175 here I would weigh 630 Lbs. Seems like an uncomfortable / unsustainable weight.
It depends on the density of the planet. If the planet has the same density as Earth (which is not certain but likely) then its gravitational force at the surface will be 1,53 times stronger than that on Earth, humans would certainly notice the difference but it's nothing that evolution can't overcome and aquatic animals won't notice any difference at all. It also depends on the speed of rotation but this effect is negligible (on Earth rotation gives only a 0.03N difference at the equator, while the force of gravity is 9.81N.)
I think there won't be large flying animals on this planet but pretty much everything else we have on Earth could evolve there as well. It's nice fantasizing about what life would look like there, though it may just as well be a lifeless rock.
645 exoplanets have been discovered so far, the first was only discovered as recently as 1995.http://exoplanet.eu/catalog.php