I have a drake and yesterday he was refusing to really walk around in the snow. i was worried but could not catch him to talk a closer look at his feet and legs, which looked fine yesterday. today i went out and noticed a black spot on the webbing of his feet. once again, i couldn't catch him to take a look. the rest of his foot looks okay so my mom was guessing it was just a part of a leaf stuck to his foot. i just brought out a little pool for him to swim around in, maybe it will come off if its a leaf. he barely goes out in the snow, and his house and pen have bedding that i always make sure to keep nice and dry. could it be frostbite? how can i tell if it is? and what should i do for him if it is frostbite?