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The cost of defending an animal's territory can be quite high. This is especially the case if the territory is large.
Adaptations increase chances of survival for a species because the better prepared that species is to defend against attackers (i.e. humans defending themselves against viruses), the better chance that species has to defend against that type of attack again in the future and prevent the threat of that species' extinction.
Leukocytes
They're devoting their live to foraging, defending their queen, and raising her offspring.
yes, that loud rapid fire drumming you hear is them announcing or defending their territory, or calling a mate
Vulnerable? Umm, who on earth told you that? They are perfectly capable of defending themselves.
With their claws.
for defending themselves from prey
bird
Their sting is their only method of defending themselves.
the us was defending themselves against japan and germany They weren't really defending themselves. They were helping the others out. The US was sending tanks, jets, and soldiers to help the others, not themselves, since it was hard for them to get attacked.
They saw the soldiers as defending themselves from a dangerous mob.
yes tapirs teeth are sharp and they use them for defending themselves.
14th
Scorpions will attempt to sting you as a way of defending themselves - being stung is not a pleasant experience.
14th Amendment
They are defending themselves and their reputation. Also because they want the shiny SUV.