Can a green head bite on your arm run down to your hand?

Yes, a green head, typically referring to a type of duck, can bite if it feels threatened or cornered. While their bites are not particularly dangerous, they can be painful. If a green head were to bite your arm and then run down to your hand, it might be trying to escape or avoid a perceived threat. It's important to approach wild animals with caution to avoid provoking them.