这些研究必需考虑到野生动物的活动范围围绕着机场上空高达3000米，方圆8公里。
These studies must consider wildlife activity up to about three thousand meters above an airport and eight kilometers around it.
记住，当时许多动物物种的活动范围是不同的，所以所有这些动物实际上都生活在那个地区。
Remember that the ranges of many animal species were different back then, so all these animals actually lived in the region at that time.
用GPS芯片来追踪动物已经有多年的历史了，这种芯片尤其被用来追踪活动范围广的动物，比如海生动物。
GPS chips have been used to track animals for years, especially wide-ranging ones like marine animals.
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