一种观点认为，这些画是兽群季节性迁徙的记录。
One opinion is that the paintings were a record of seasonal migrations made by herds.
季节性迁徙是另一种逃避方式，特别是对大型哺乳动物或鸟类来说尤为如此。
Seasonal migration is another form of escape, especially for large mammals or birds.
在撒哈拉沙漠，和其它大多数食草动物不同，长颈鹿在干旱季节不迁徙(离开它的家)，因为它可以从吃的叶子中获得充足的水分。
Unlike most of the other grass-eaters in the Sahara, the giraffe doesn't migrate (leave its homeland) during dry seasons because it gets enough water from the leaves it eats.
他们的生活方式类似于半游牧，而且甚至还跟猎物迁徙和特定果实的成熟季节有关。
Their lifestyle is semi-nomadic, and the movements are somewhat seasonal, having to do with the migration of some prey animals, and the gathering of certain plants and fruits.
我们的祖先很早就已经知道如何根据季节的变化，预计渔汛的大小、安排庄稼的种植和收割等，甚至能估算迁徙的鸟群过往的时间。
Our earliest ancestors learnt how to judge when the seasons would change so that crops should be planted, fish would be plentiful, or when migrating herds would pass some local point.
环志是研究鸟类季节性迁徙的重要手段之一，同时也是研究鸟类区系、生态学、形态分类学等的有效方法。
Bird banding is one of the important means to research the seasonal migration of birds, and is an effective method in researching the faunas, ecology and morphology of birds.
环志是研究鸟类季节性迁徙的重要手段之一，同时也是研究鸟类区系、生态学、形态分类学等的有效方法。
Bird banding is one of the important means to research the seasonal migration of birds, and is an effective method in researching the faunas, ecology and morphology of birds.
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