On a crisp autumn evening in my backyard, I hear a gray treefrog’s slow musical trill. A reply sounds from the planter on our deck. The air is cool, dry, and leafy. I often see treefrogs when they are green and nestled on a hosta leaf. Still, they adapt to their surroundings and turn a mottled gray when I spy them snugged along a wall of our cedar planters or tucked into the spout of our watering pitcher. At night, they climb up our deck doors with their white bellies and large toepads smooshed against the glass. The croaks echo…