It is possible, yes. This however, is a difficult proposition as most of the US-Mexico border is heavily monitored, or crosses dangerous areas -- such as the Sonoran and Chihuahun deserts.
Be a Ninja
In the Aeneid: Book I, Venus conjures a cloud to shroud Aeneas and his friend, Achates, so that they can enter the city of Carthage without being seen.
I have seen several being referred as "shrines", that would be "retablos" and "altares"
Blend in with your enviorment and act normally
Be quiet. Moose get disturbed easily.
Probably.
so that it can hunt its prey without being seen
ANSWER:Because he can and he knows he can get away with it without being seen.
when you shoot without being seen. kind of like a hidden shooter
Your chances of 'getting around' in Antarctica without being seen are pretty high, since there aren't enough people there to 'see' you. It is, however, an extremely dangerous place to be without logistical support, guides, food, shelter and companions who can save your life if necessary.
It damaged the US-Mexico relations for decades, without a clear benefit being attained.
put a hidden camera up and watch them from another room..:)