all
warnings
that
carry
for
long distances, advertising to possible invaders that someone else's territory is being approached.Many animals rely on smells to mark their territories or leaving droppings around the territories.Other animals will be warned off the territory without ever meeting with the territory's defender.
Sometimes,
these warnings may be
ignored,
and an invader may move accidentally into a neighboring territory, or two animals may meet near the border of their nearby territories.When the two animals meet, they will generally threaten each other with visual (视觉的) displays.These displays will often exaggerate an animal's size by putting up feathers or fur, or will show off the animal's weapons.The animals may go through all the behavior of fighting without ever actually touching each other.The displays are generally performed best near the center of an animal's territory, where it is more likely to attack an invader and where retreating becomes more of a choice.
Actual fighting usually only happens in overcrowded conditions, when resources are not enough.Serious injury can result, and old or sick animals may die, leading to a more balanced population size.Under most natural conditions, territoriality is an effective way of maintaining a healthy population.The study of social behaviors such as territoriality in animals may also help us to understand human society.
【2017届高考英语一轮复习检测:Unit5 Theme parks (人教版必修4)Word版含答案】相关文章:
★ 湖南省岳阳市2014高考英语一轮单项选择训练题(8)及答案
★ (全国通用)2014届高考英语一轮单元复习 限时强化训练六
★ 安徽省淮南市2014高考英语一轮单项选择及文章训练(23)及答案
★ 浙江省湖州市2014高考英语完形填空一轮(暑假)精炼(7)含答案
★ 四川省2016届高考英语一轮复习课时作业(43) Module 1 Deep South 外研版选修8
★ 2014高考英语(新人教版)一轮基础训练(18)A、B卷(附答案或解析)
★ 四川省2016届高考英语一轮复习课时作业(28) Module 4 Carnival 外研版必修5
★ 2014届高考英语一轮复习课时作业(三十一)选修6Module 1《Small Talk》(外研版)
★ 2014届高考英语一轮复习课时作业(四十三)选修8Module 1《Deep South》(外研版)
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21