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Ocean
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 (07-26-2019, 07:34 AM)Rishi Wrote: Walrus found sleeping on one the crew-hatches of surfaced Russian submarine, earlier this year. This case is from Kamchatka region 2006, there are many more photos. Funny incident :)  
It looks like walruses like their time alone as well. Walruses that isolate themselves are usually sick ones ( a video posted by Graaaah years ago which has expired, the sick walrus became prey for a polar bear) and old carnivorous bull walruses.
Cross‐genus adoptions in delphinids: One example with taxonomic discussion
Abstract Although relatively rare, adoptions have been reported in a number of mammals, involving almost exclusively individuals of the same species, and hardly ever between species or across genera. Adoption remains poorly documented and its proximate causes are controversial. Here, we describe a unique case of a cross‐genus adoption within a small community of common bottlenose dolphins (Tursiops truncatus) at Rangiroa Atoll in French Polynesia. It involves a foster female adopting a presumed melon‐headed whale (Peponocephala electra) calf while already mothering its presumed biological offspring. While the inclusive fitness hypothesis can be rejected for this adult female mother, acquisition of parental skills is also unlikely to have driven adoption in parallel to natural motherhood. We argue that the primiparous foster mother’s inexperience and personality may have contributed to factors driving such non‐adaptive behavior. We also propose that the adoptee’s persistence in initiating and maintaining an association with the adult female bottlenose dolphin could have played a major role in the adoption’s ultimate success, as well as the persistence of this cross‐genus adoption after the disappearance of the biological offspring. A brief discussion of adoption and hybridization within the Delphinidae taxon is included to identify how this cross‐genus adoption fits into context of marine mammal parental care. https://onlinelibrary.wiley.com/doi/abs/10.1111/eth.12916
I confess having a sort of admiration towards morays. Even having a beautiful color, they are something reptilian... Here the green moray eel is living Western Atlantique from New Jersey, Bermuda, and the nothern part of the Mexico Gulf to Brazil. Its length is up to 2m50. Living at deepth down 40 m. The green moray is one of the 202 known species divided among 16 genera.
I believe that, unlucky, there is the penguin's last seconds of life. The leopard seal is about to catch it.
WHITE SHARKS AND DRONES
In some parts of the world, drones are used to protect swimmers and surfers. White sharks often swim very close to shore, especially near seal colonies. Like many predators, they seem to be opportunists. The shark in the video immediately attacked a seal when the opportunity presented itself: https://www.youtube.com/watch?v=XtSAnt2HnhU Every now and then, white sharks attack swimmers, divers or surfers. Unprovoked attacks are few and far between. Not seldom, the victim is bitten once only. Most experts think these attacks are a result of a mistake, but there's no reason to assume that visual hunters like white sharks should be involved in mistakes. Maybe most attacks are a result of opportunistic behaviour. Predators are observers. Most of them investigate situations. In a somewhat cautious way, one has to add. A bit like big cats, so it seems. Both big cats and white sharks are stalkers. Not seldom, they surprise the object that attracted their attention. Those who know agree white sharks like surprises. The reason is it often results in an advantage. For a professional hunter like a white shark, a 'feel' is the best way to get to good information. If close contact feels ok, a bite could be the result. Compared to marine mammals and fish, humans are much more 'bony'. At least, that's what shark authorities say. This, they think, could be the reason white sharks only bite once. Every now and then, however, there is no cautious bite but a deliberate and often devastating attack. Some of those attacked in this way have been completely eaten. Although different from the usual method used, it would fit an opportunist like a white shark. It's not known why white sharks at times attack and consume humans. What we know is they only very seldom attack. People wonder why sharks attack humans, but the question is why sharks only very seldom use their advantage: https://www.youtube.com/watch?v=VrXp_PHUOUI To finish the post, another example underlining the point made on sharks and humans. In the video, a tiger shark is seen swimming close to shore. Those enjoying the water don't know the shark is less than 10 yards away. The shark, big enough to cause considerable damage, isn't interested: https://www.youtube.com/watch?v=uSYJwLBVtto |
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