A note for nature-lovers: check out iNaturalist. This link will take you to a fantastic website where you can share your photos and observations of any wildlife or plants you find on the Presidio. You can also browse through hundreds of other people's observations - and perhaps identify that strange flower you've been wondering about, or that weird bush that's taking over your backyard.
It also seems that one of the site's contributors, "js_young" is Jonathan Young, the Presidio's first-ever wildlife ecologist. He's a recent hire, and it's his job to get a better sense of the many animals who inhabit our park - and maybe help figure out if we've gone over our four coyote maximum.