您现在的位置: 首页 > 英语听力 > 媒体资讯 > 60秒科学 > 正文

60秒科学:Box Jellyfish Eyes Aim At The Trees

时间:2011-05-05 14:09:38 来源:scientificamerican 编辑:sunny  每天三分钟英语轻松学

Box jellyfish have it over the rest of the jellyfish world—they have true eyes, featuring corneas, lenses and retinas. They have a more sophisticated nervous system too. They still don’t have a real brain, but those eyes enable them to actively hunt prey. Other jellyfish just drift and hope. Well, not really hope, because you can’t do that without a brain.

Anyway, it’s been long known that box jellies had eyes, 24 in fact, of four different types. But now researchers have found that four of those eyes just look up, and out of the water. The work appears in the journal Current Biology. [Anders Garm, Magnus Oskarsson and Dan-Eric Nilsson, Box Jellyfish Use Terrestrial Visual Cues for Navigation]

The studied jellies live in mangrove swamps and the studied eyes are always aimed at the tree canopy. By tracking the canopy the jellies can navigate to their preferred spots—where their favorite food, small crustaceans called copepods, are plentiful.

Their various eyes show that the jellies evolved a clever strategy. Rather than a single set of peepers that collect info for processing by a big brain, box jellies have different eye types responsible for informing different behaviors, with no brains. More evidence that it can be a mistake to overthink a problem.

收藏

相关热词搜索: 60秒科学

上一篇:听名著:《爱丽丝漫游仙境》第128期:审讯暂停

下一篇:VOA新闻听力:本.拉登之死促纽约市加强安全戒备

您可能还感兴趣的文章

60秒科学:满月预示狮子攻击增加
听力文本满月之后,食人狮的活动愈加频繁……Think humans are at the top of the food chain? Not quite, in parts of Africa. Lions have attacked over 1000 people i

时间:2011-07-28 编辑:sunny

60秒科学:睡前接触电子产品影响睡眠
听力练习睡前接触电子产品影响睡眠 The National Sleep Foundation released the results of its annual sleep poll today, where they surveyed more than 1,500 people

时间:2011-03-09 编辑:sunny

60秒科学:商标名与消费者行为之间的有趣关系
听力练习研究发现,与驾驶标有其他饮料logo汽车的实验者相比,驾驶红牛车的实验者要更勇猛。Companies spend billions on advertising every year. But they're not just

时间:2011-02-11 编辑:sunny

60秒科学:Cancer Drugs May Also Treat Alcoholi
As we recover from the holiday weekend, there’s some intoxicating news on curbing the effects of alcohol. In the May 29th issue of Cell, scientists report dis

时间:2009-05-27 编辑:echo

最新文章

无觅相关文章插件,快速提升流量