Category: cetacean

cedorsey:© Video Credit Baby whales don’t know…

cedorsey:

© Video Credit

Baby whales don’t know how to breathe, so their mothers have to hold them up, close to the surface, until they learn. 

essenceofnatvre: planetearthtv Every year, one…

essenceofnatvre:

planetearthtv

Every year, one of the largest migrations in the world happens off the east coast of South Africa, the sardine run. Reports from spotter planes have mentioned shoals as big as 7 km long and 1.5 km wide (4.3 x .9 mi), usually accompanied by dolphins in their thousands. Here a baleen whale takes its turn on the banquet.

🎥 & Caption by @oceanx @brocqmaxey

Bryde’s Whale fun fact: when swimming, they may abruptly change direction, for no apparent reason. Their breathing pattern is irregular too. Science has no explanation for Bryde’s whales being the way they are.

geographicwild: . ‘Every year from July to la…

geographicwild:

.
‘Every year from July to late October southern humpback whales migrate north from their Antarctic feeding grounds to give birth in the warm sheltered waters off Tonga. Ray encountered this humpback mother and calf peacefully floating in the plankton-filled water around the island group of Vava‘u, Tonga.After Ray gently approached them, the giants swam a bit closer to have a look at him.While they made this elegant turn, Ray took the shot. #nature #underwater #humpbackwhales #whales #tonga
Photograph: Ray Chin/Natural History Museum

Do aquatic mammals have eyelids? Or are their …

Do aquatic mammals have eyelids? Or are their eyes more like fish so they never close?

They do! I’m gonna talk about dolphins and whales because, as cute as the eyes of other aquatic mammals may be, I don’t know much about them. 

Unlike ours, the eyelids of cetaceans are chubby, they are really thick, but that’s no issue to them, because they don’t close them often. They don’t need to blink as much as we do. When they do blink, they spread these jelly-like tears all over the eyes to protect them. The tears are so viscous they can cover the eye for a long time. 

They shut their eyelids when they sleep as well, but in that case they tend to only close one eye. Whales and dolphins only sleep with one half of the brain, while the other half stays awake. They keep one eye open, so they can stare deep into your soul even while they nap.

image

Gray Whale eye by Tarnya Hall

wildpreciouslife: worldofwhales: Pregnant hum…

wildpreciouslife:

worldofwhales:

Pregnant humpback whale taking a nap 💙 Clark Little

This is super cool. 

Does anyone know how to tell that the whale is pregnant?

Well in this case you can tell because she’s big, even for whale standards. Her belly is very large and has a rounder shape than your ordinary humpback, which would look leaner, like the one below.

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But there are pregnancy tests for whales as well, basically a bunch of curious marine biologists jump onto a boat, they use a dart to get a skin and blubber sample from the whale and they measure the concentration of progesterone in the blubber to find out if there’s a big baby on the way 😀

[recorded by Jason Gedamke]

[recorded by Jason Gedamke]

[recorded by Passive Acoustics Group, NEFSC/NOAA]

It’s not Star Wars. It’s not dubstep. 

It’s a Minke Whale. Those are Minke Whale vocalizations. Relax. Drink some water and accept this.

csnews: First study of humpback whale surviv…

csnews:

First study of humpback whale survivors of orca attacks in the Southeastern Pacific

Smithsonian Tropical Research Institute – November 6, 2018

Humpback whales bear stark battle scars from violent encounters with orcas, also known as killer whales. Analysis of rake marks on more than 3000 humpback whale tails or flukes suggest that attacks on these undersea giants may be on the rise, according to a new study in Endangered Species Research.

“We set out to discover where, when and at what age humpback whales in the Southeastern Pacific are attacked by orcas,” said Hector M. Guzman, marine ecologist at the Smithsonian Tropical Research Institute.

Orcas, Orcinus orca, like humans, are apex predators. Although they can feed on more than 20 different species of cetaceans, they usually prefer sea lions, fur seals, fish and sea birds. “Because the chances of observing rake marks on young, vulnerable whales increased in the last 20 years, we think that killer whale attacks on humpback whales may be more common now than they were in the past, perhaps due to the recovery of whale breeding stocks in the Southeast Pacific after hunting was prohibited,” said Juan Capella, lead author and marine biologist from Whalesound Ltd. in Chile.

Keep reading

protectrightwhales: A pair of North Atlantic …

protectrightwhales:

A pair of North Atlantic right whales traveling south off of Little St. Simons Island on the coast of Georgia on January 31, 2018. The whale surfacing at the bottom is named Halo (#3546), she was born to Loligo (#1246) in 2005. Halo last had a calf in 2014 and is one of only around 100 females of breeding age in the population. We posted a picture of her on November 11th that can be found here.

credit: Sea to Shore Alliance, NOAA permit #20556

worldofwhales: Whales rely heavily on their se…

worldofwhales:

Whales rely heavily on their sense of hearing. The deep, dark waters they live in make it difficult for them to rely on other senses, so they evolved to become extremely sensitive to the sounds that surround them.

They are social animals who communicate through incredibly elaborated systems of sound. They recognise each other thanks to sounds, they use those sounds to tell each other things, noises warn them when a danger is coming and they even find food thanks to that stunning sense of hearing they have. 

Noise pollution makes all of this impossible for them. It makes it impossible to recognise or understand their world. It’s physically painful to them and it overshadows their voices.  

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Exactly why whales and dolphins strand is not fully known but factors can include sickness, navigational error, geographical features, a rapidly falling tide, being chased by a predator, or extreme weather.

[read full article on NDTV]

Those are all hypotheses and sadly hypotheses are all we have when it comes to understanding this phenomenon. But I would like to mention yet another hypothesis, or better, one reason why “navigational error” might occur.

Noise pollution.

earthandanimals: How Do Whales Avoid Sunburn?…

earthandanimals:

How Do Whales Avoid Sunburn? Hint: Some Tan.

Sperm whales must contend with getting too much sun, as they can spend hours at the ocean’s surface.

Photo by Stephen Frink

Read more at National Geographic