12歲女海中被鯊魚攻擊2次　上岸鮮血狂流「腿上遍布100處咬痕」

會有記憶遺傳變成本能

邊個同你講鯊魚會教育後代嘅好心你就同佢絕交啦

所以咪要殺咗佢囉

渣架

Baby shark dodododo

有冇咬過人都會咬人㗎啦，鯊魚冇智慧教育下一代

真.
鯊魚D教育水平一向唔差 好多學府排名都OK

你講上次埃及嗰單丫麻

其實鯊魚視力麻麻

唔排除某啲品種有個別例子
但一般嚟講鯊魚視力其實好好，喺水入面嘅視力比人類好10倍
首先鯊魚眼嘅構造同人類眼球相近，都係有cornea+lens+retina+iris+pupil，同埋有rods+cones呢2種photoreceptors
佢仲有tapetum lucidum係人類冇所以喺極少量光線嘅情況下都可以睇得好清楚

https://www.fisheries.noaa.gov/feature-story/12-shark-facts-may-surprise-you
https://www.aquarium.co.za/news/look-here-how-well-do-sharks-see

呢段study雖然淨係搵port jackson shark呢個品種去做實驗
但係都發現到其實佢哋識得由觀察同社交當中學習
呢種行為可唔可以叫做教育就係另一個問題

The main finding is that even a bottom-dwelling, solitary shark can learn faster by watching and interacting with other sharks. For many decades, the ability to learn from others was considered an advanced skill of ‘higher’ animal groups like primates. Our study, together with many recent works on shark learning abilities, shows once again that sharks are intelligent and complex animals

https://www.forbes.com/sites/melissacristinamarquez/2020/04/08/yes-sharks-can-learn-stuff-really/?sh=70e538c66a0b
by Melissa Cristina Márquez - marine biologist

傳言話鯊魚視力差應該係源於佢哋睇唔到顏色呢個impression
雖然佢哋有齊rods+cones呢2種photoreceptors，但係每種都係得單個，唔似陸上動物咁通常有2~3種cones，所以睇嘢只係得黑白色
但係睇唔到顏色唔代表佢哋冇visual acuity
鯊魚眼構造上面都解釋咗，仲未提佢哋隻眼嘅位置令佢哋可以睇到廣角視野

http://www.savethesharksorg.com/blog/2021/9/24/shark-eyesight
https://www.epicdiving.com/shark-vision/#comments

圖一左邊個手勢勁寸