If your creature were capable of climbing trees, you would have to rule out standard wings and go with something less conventional, like a baggy flap of skin that catches the wind, as seen on the flying squirrel or lizard.
(your creature; were; capable of climbing trees) (a baggy flap of skin; catches; the wind) (you; to rule out; standard wings) (you; to go; with something less conventional, like a baggy flap of skin)
your creature a baggy flap of skin you you
were catches to rule out to go
capable of climbing trees
the wind
standard wings
with something less conventional, like a baggy flap of skin