Aphids which spray sticky stuff on cars parked below maple trees, waste most of the sap just to get the minerals.


aphids excrete (piss) consentrated sap, (after extracting minerals and other nuturients), its called 'honey dew', there are species of ants that 'herd' aphids, and collect the honey dew, and use the honey dew as a food..

there is some evidence that the aphids sucking the sap is actually good for trees.. sap can get 'vapor locked' (just like a a gas line in cold weather) and the collective action of aphids help keep the sap moving.