Read today's Portuguese stories delivered to your email.
According to a new study on humpback whales, the reason they continue to swim into fishing gear is that their eye has a large sclera, and it is thick in the back of the eye, which shortens the focal length.
By PA/TPN, in North America · 31 May 2025, 16:31 · 0 Comments
Humpbacks have a low density of retinal ganglion cells, with a maximum capacity density of 180 cells per square millimetre, vastly under the human 12,000 to 38,000 cells per square millimetre.
The visual acuity of the sight of a humpback whale is 3.95 cycles per degree, significantly lower than the human 60 to 100 CPD, and even less than the threshold for human blindness at 6 CPD.
Share this article: Share
In North America, World, Politics, Economy - 02 Aug 2025, 16:31
In North America, World, Economy - 02 Aug 2025, 15:31
In North America, World, Health - 26 Jul 2025, 15:31
We are proud to provide our readers from around the world with independent, honest and unbiased news for free – both online and in print.
Our dedicated team supports the local community, foreign residents and visitors of all nationalities through our newspaper, website, social media and our newsletter.
We appreciate that not everyone can afford to pay for our services but if you are able to, we ask you to support The Portugal News by making a contribution – no matter how small.
Be the first to comment on this article
In North America, World, Politics, Economy - 02 Aug 2025, 16:31
In North America, World, Economy - 02 Aug 2025, 15:31
In North America, World, Health - 26 Jul 2025, 15:31
In North America - 20 Jan 2024, 17:31
In North America, World, Environment - 13 Jan 2024, 17:31
In North America, World - 16 Dec 2023, 17:31
In North America - 10 Jun 2023, 15:31
In North America - 23 Feb 2023, 16:31
In North America - 15 Feb 2023, 17:31
In North America, World - 19 Jul 2025, 14:31
In North America, World, Health - 12 Jul 2025, 15:31
In North America, World, Health - 05 Jul 2025, 15:31
In North America, World - 05 Jul 2025, 14:31
In North America - 04 Jul 2025, 15:31
In North America, Madeira & Azores - 04 Jul 2025, 14:31
English
Nederlands
Deutsch
Français
Español
Italiano
Svenska
Pусский
Română
中文
Türkçe
हिन्दी
Português
Українська
اردو
Polski
عربي
Suomi
עִברִית
Português (Brasil)