Territorial Behavior

Antelope: Antilocapra americana. This shows two male antelopes fighting to determine which antelope will stay with the rest of the herd and lead the herd. One of the male antelopes originally claimed the herd as theirs so he fights to keep his herd while the other one comes to take this herd over and become its new leader. Commonly in fights like this, one dies but in some cases one of the antelopes surrenders.

http://us.123rf.com/400wm/400/400/EcoSnap/EcoSnap0901/EcoSnap090100030/4118781-two-male-gemsbok-antelopes-oryx-gazella-fighting-for-territory-kalahari-desert-south-africa.jpg

German Shepard-Canis lupis familiaris

http://www.petwave.com/~/media/Images/Center/Behavior/Dog/Urine%20Marking/German_Shepherd_Peeing.ashx

This is an example of territorial behavior because this dog is marking its territory bu urinating on a tree. This signifies that this tree belongs to that dog and other dogs don't come near this tree because they can smell the previous dogs urine. And if this dog sees an intruder trying to mark this tree as its territory then they will end up fighting and the winner gets the tree.