Something is causing green Douglas-fir cones to fall from the trees before they are ripe. And, the cones are getting piled up into mounds. Who’s doing this?
Let's take apart a Douglas-fir cone with a pair of kitchen shears. What's inside?
For old cones, you'd expect that most or all of the seeds are gone, which is what we find.
What do Douglas-fir seeds look like? How many are there?
And finally, read this for a trick question ...