sycamore and birch are the start with maple if it is sweet type and you can also do walnut , cocco nut, date, oil palms, so there is quite afew as for sap removel it is basicly a small hole say 13mm wide and deep with a hos epipe stuffed into it with the sap draining into a small sealed container like a pop bottle from there we can boil reduce and have syrup or ferment into alcahol