Box jellyfish have it over the rest of the jellyfish world—they have true eyes, featuring corneas, lenses and retinas. They have a more ___1___ nervous system too. They still don’t have a real brain, but those eyes enable them to actively hunt prey. Other jellyfish just ___2___. 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 ___3___ the canopy the jellies can ___4___ 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 ___5___ a problem.
【視聽版科學(xué)小組榮譽(yù)出品】
sophisticated drift and hope tracking navigate overthink
箱水母進(jìn)化出了真正的眼睛,很有特點(diǎn)的眼角膜,晶狀體還有視網(wǎng)膜,簡(jiǎn)直是水母一族中中的傳說(shuō)啊.不僅如此,它們還擁有更為復(fù)雜的神經(jīng)系統(tǒng).雖然它們大腦還未真正成形,但靠眼睛就能讓它們主動(dòng)對(duì)獵物發(fā)起進(jìn)攻.不像其它同類只能四處游蕩,滿心期待.也不能算是真正期待,畢竟那得用腦子啊. 人類很早就發(fā)現(xiàn)箱水母有四種不同類型的眼睛,一共24只.研究人員近期發(fā)現(xiàn)箱水母有四只眼睛是露出水面向上看的, 這項(xiàng)研究成果刊登在<當(dāng)代生物學(xué)>期刊上. 研究人員研究了生活在紅樹林沼澤地帶的水母,他們發(fā)現(xiàn)水母的眼睛總是盯著樹冠.因?yàn)槎⒅鴺涔?水母?jìng)兙湍苷业剿鼈兊臉?lè)園-----那里到處都是它們的最愛(ài):一種橈足類的甲殼綱動(dòng)物. 箱水母各式各樣的眼睛表明它們進(jìn)化得更聰明了.雖沒(méi)有大腦,但它們不同種類的眼睛分擔(dān)不同功能,而不是一整個(gè)通過(guò)大腦支配的單純的信息收集器.所以說(shuō)嘛,想太多有時(shí)候真不是好事~