2017年1月-南美洲秘魯-亞馬遜雨林
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每群猴都有自己的領地。為了保護領地不受侵犯,吼猴首領每天早上起來以後,第一件事就是張開大嘴吼叫一番。吼猴的吼聲是一種威脅,當一群吼猴進入另一群吼猴領地的時候,兩群吼猴就會展開一場吼叫比賽。兩群吼猴越吼聲音越大,最後誰吼得最響,誰便獲勝。擁有發達的舌骨,用以保護髮聲器官。在晨昏活動、遇到敵害或爭奪領地時,可發出巨大吼聲,叫聲能夠持續40多分鐘,5公裡外都能聽得見,吼叫聲達到128分貝,這相當於老虎吼聲的分貝等級,相當於打雷的聲音。
叫聲越大的吼猴是一種“虛張聲勢”的表現,它們大聲吼叫是為了吸引雌性,壓制求偶競爭者,以及嚇退掠食者,通常這樣的吼猴睾丸較小,體內缺少精子。但舌骨和睾丸之間關係卻呈現出反比關係,這也就是說,叫聲越大的吼猴,睾丸尺寸越小。睾丸大的吼猴更容易融入大群體,而叫聲大一些的吼猴通常更願意生活在只有它一隻雄性猴存在的小群體中。
生活在大群體中的雄性猴,由於其擁有旺盛的性能力,一般不缺配偶,它們只需要通過相互競爭使更多的母猴懷孕即可保住自己的地位,而生活在小群體中的雄性猴雖然沒有前者那麼有魅力,但它的叫聲可以驅趕其他的雄性和入侵者,從而保護自己族群的母猴,這樣即使性能力不夠強,也沒有太 大關 系。畢竟想要同時達到叫聲大和性能力強是非常困難的。
吼猴是全素食者,各種各樣的樹葉、果實、堅果和種子它都吃。吼猴要花三到四小時進食。它常常用尾巴倒懸在樹上,直接用嘴啃食樹枝上的葉子和果實,或者用尾巴將食物拉過來而不是用前肢採摘。森林里的樹葉大多包含有生物鹼和毒素,吼猴有很好的辨別能力,總是挑選樹葉中含毒量最小的部分,如葉柄、嫩葉和成熟了的果實來吃。吼猴棲息在樹上,從不輕易下樹,即使是口渴時,也只是添些潮濕的樹葉來解渴。
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