Competition (biology)
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Competition is an interaction between organisms or species in which both require a resource that is in limited supply. Competition lowers the fitness of both organisms involved since the presence of one of the organisms always reduces the amount of the resource available to the other.
Great egret and neotropic cormorant competing over territory
Male-male competition in red deer during rut is an example of interference competition within a species.
Sea anemones compete for the territory in tide pools
Medium ground finch (Geospiza fortis) on Santa Cruz Island in the Galapagos
Territory (animal)
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In ethology, territory is the sociographical area that an animal consistently defends against conspecific competition using agonistic behaviors or real physical aggression. Animals that actively defend territories in this way are referred to as being territorial or displaying territorialism.
Ring-tailed lemurs hold their distinctive tails high in the air during territorial scent marking. They also engage in "stink fights" with intruding males.
The antebrachial scent gland and spur on the forearm of a male ring-tailed lemur
Two domestic cats posturing during ritualized aggression over a territory
A western marsh harrier is mobbed by a northern lapwing. The marsh harrier, a male, had been quartering the ground in which lapwing and redshank were nesting.