How do you ID the difference between a milk snake and a king snake (physical differences)?
Milk snakes are a subspecies of king snakes, so first of all you don't need to know how to ID them, and second of all I don't think there is any discernable difference besides the fact that there are more varieties of milk snake colorations.
Two years ago I knew stuff about rocks, minerals, experiments, and ecosystems, yay!
Last year I knew stuff about amphibians, reptiles, freshwater, and more experiments, yay again!
Now I know stuff about oceanography, saltwater, and birds, yay for the third time!