Eight million years ago, a shift轉變 in the climate氣候的轉變 caused more barren貧瘠, open landscapes景觀 to spread傳播 across the globe. And without the cover of trees, large animals grouped together for protection.
This, the scientists say, was when wild dogs started to work together, teaming up聯手 to drive big prey大獵物 out of the herd群. The Colombian team examined檢查 the skulls頭骨 of more than 300 dog species種類, building a timeline that revealed透露 how their jaws and teeth had evolved.演變
This revealed that the wolves from which our domestic dogs家犬 descend下降 started to change when they began to hunt in packs. From then on, the dogs with the biggest teeth and most powerful jaws were most likely to succeed in overpowering their prey, so they passed their 'hypercarnivorous' genes on to the next generation.
The researchers say that this is what's given our pet dogs such good evolutionary reasons進化原因 to really enjoy chewing on咀嚼 bones.
This, the scientists say, was when wild dogs started to work together, teaming up聯手 to drive big prey大獵物 out of the herd群. The Colombian team examined檢查 the skulls頭骨 of more than 300 dog species種類, building a timeline that revealed透露 how their jaws and teeth had evolved.演變
This revealed that the wolves from which our domestic dogs家犬 descend下降 started to change when they began to hunt in packs. From then on, the dogs with the biggest teeth and most powerful jaws were most likely to succeed in overpowering their prey, so they passed their 'hypercarnivorous' genes on to the next generation.
The researchers say that this is what's given our pet dogs such good evolutionary reasons進化原因 to really enjoy chewing on咀嚼 bones.
http://www.bbc.co.uk/worldservice/learningenglish/language/wordsinthenews/2012/07/120710_witn_dogs_life.shtml
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