It's hunting for millipedes. 它在寻找千足虫

279. It's not really a worm,
     然而它并不是一种蠕虫
280. but a poisonous, caterpillar-like beetle.
     而是一种酷似毛毛虫的有毒甲虫
281. The yellow lights warn other creatures to keep out of its way.
     黄灯亮起 以警告其他动物莫要挡道
282. It's hunting for millipedes.
     它在寻找千足虫
283. When it finds the trail of one,
     当它发现可疑踪迹时
284. it switches off its yellow lights.
     便会熄灭黄灯
285. Now it only has a red light on its head.
     现在它仅留一盏头顶的红灯

来自《行星地球 第二季 第三集 Planet Earth S02E03 丛林》第 282 行