Mastodawn

Amazon River Dolphin Silhouette by Hussain Aga Khan, Switzerland

#Botos look very unusual compared to other dolphins, with incredibly long rostra, with vestigial hairs on them, tiny eyes and thick bodies.

#photography
#underwater
#Amazon
#RiverDolphins

Lukas VFN 🇪🇺Jul 26, 2024

3D models show #dolphins already used narrow-band sound waves for orientation 5 million years ago https://phys.org/news/2024-07-3d-dolphins-narrow-band-million.html

Predicting ecology and hearing sensitivities in Parapontoporia—An extinct long-snouted dolphin https://anatomypubs.onlinelibrary.wiley.com/doi/10.1002/ar.25538

They colonized rivers, which links them to today's rare and endangered #RiverDolphins. Investigating the sensory systems of toothed #whales can help to understand the influence of habitat on their hearing and the evolutionary dynamics of marine mammals.

3D models show dolphins already used narrow-band sound waves for orientation 5 million years ago

Senckenberg researcher Dr. Rachel Racicot and her former student Joyce Sanks from Vanderbilt University have examined the inner ear of the extinct dolphin genus Parapontoporia. In their study, published in the journal The Anatomical Record, they show that the toothed whales had already developed specialized high-frequency hearing in the Miocene.

Phys.org

Lukas VFN 🇪🇺Mar 21, 2024

Ancient giant dolphin discovered in the Amazon https://phys.org/news/2024-03-ancient-giant-dolphin-amazon.html

The largest freshwater #odontocete: A South Asian river #dolphin relative from the proto-Amazonia https://www.science.org/doi/10.1126/sciadv.adk6320

"#RiverDolphins are among the rarest modern #cetaceans, with most extant species critically endangered. Despite their similar appearance, however, these animals are not directly related, but represent the late survivors of different #cetacean groups that once inhabited our planet."

Ancient giant dolphin discovered in the Amazon

Paleontologists from the University of Zurich have announced the discovery of a new species of freshwater dolphin in the Peruvian Amazon region. Surprisingly, its closest living relatives can be found in the river dolphins of South Asia.

Phys.org

Wodne Sprawy Jan 22, 2024

#dolphins #water #river #mammals #riverdolphins #Amazon #extinction

Many people, admiring vacation photos, do not realize that dolphins are residents of more than just the seas and oceans. Equally important for their ecosystems are river dolphins, which are an important natural link. Unfortunately the survival of these animals is under threat and recent international efforts to protect them underscore the urgent need for intervention.

https://wodnesprawy.pl/en/river-dolphins-are-dying-at-an-alarming-rate-quick-response-needed/