Why are there so many deer at Valley Forge park in PA?

== == * Because well meaning humans fooled around with the balance of nature. Just like Yellow Stone National park there was an over abundance of wolves, so instead of relocating packs of wolves they eliminated so many that the deer were too plentiful and were destroying the ash trees which in turn caused marshland. Also these deer would go to the river and where there was once reeds along the riverbed there was nothing. Forestry found old photos of what Yellowstone looked like in past decades and came to the realization that once again humans had to go "oops" and introduced more wolves back into the park.