Marine mammals are famously large, but why is that? And is there a polar bear-sized sea otter in our future?
Check out PBS Eons!: https://www.youtube.com/watch?v=_OSRKtT_9vw
Hosted by: Olivia Gordon
Head to https://scishowfinds.com/ for hand selected artifacts of the universe!
Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow
Dooblydoo thanks go to the following Patreon supporters: Jerry Perez, Lazarus G, Sam Lutfi, Kevin Knupp, Nicholas Smith, D.A. Noe, alexander wadsworth, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali. Kevin Bealer, Philippe von Bergen, Chris Peters, Justin Lentz
Looking for SciShow elsewhere on the internet?
Oh my God! Olivia is sooooo much better in this video than she used to be, not to mention her improved looks. Her hair is stunning and just look at these earrings ). The intonation could be a bit more diverse but it’s just a matter of practice.
Otters also have other methods for heat conservation that might reduce the need for large body size. They have fur that traps bubbles of air for insulation. They constantly groom this fur to make sure its stays as efficient as possible at keeping them warm, and have special oil glands that help with grooming.
Unlike all those other marine mammal groups otters rely on fur for insulation. I believe fur is a better insulator than blubber and otter fur is ridiculously dense. That might be why they haven't got so big.
Not being 500kg could be an advantage to the sea otter’s successful lifestyle (fur trade hunting aside). Unlike the other seagoing mammals they don’t have blubber, instead they have the outright densest mammalian fur which needs constant cleaning to trap an insulating air layer underwater. Extra energy expenditure & time for fur cleaning may preclude the extra hunting needed (25% of bodyweight per day) for a larger body size.
I think sea otters are small because they followed a different evolutionary path. Whales, seals, and manatees have no fur and instead depend on their blubber to keep warm and have the cold water in contact with their skin. Otters on the other hand have some of the thickest fur of any mammal which traps a lot of air and keeps their skin from getting wet. Unless there is some process that puts pressure on them to lose that fur I don't think they'll grow a whole lot larger
Remember, whenever a god botherer tries to be clever with you and starts babbling about evolutionary "changes in type" or "macro evolution" just point out marine mammals like whales and seals.
Proof positive that both of those [nonsense terms that they try to pass off as science] actually happened because nothing evolved air breathing lungs underwater!! 8D
This science-based video starts by giving the finger to science. Stating an mere idea as though it were a fact is arrogant, dismissive, provocative, divisive, and above all, NOT scientific. This video says - with certainty - that the Blue Whale is the most massive animal ever to exist. But while that appears to be true, it's impossible to be certain. This may seem like no big deal, but this kind of sloppy communication is part of why public confidence in science, and expertise in general, has been eroding in the U.S. for decades. It's not a weakness to qualify your statements. If you take it on yourself to communicate science, THINK IT THROUGH. Blue Whales are thought to be the largest animals ever, but unless and until you can PROVE they are, STOP saying it like it's written in stone. People are smart enough to handle nuance, and they also remember all the occasions arrogant-sounding scientists made absolutist claims that turned out to be wrong. Stop being part of the problem!
Blue Whale maybe not the biggest Animal ever :)
Not sure, if this is gonna be confirmed, but it seems due to estimation, that the Blue Whale might being challenged by an Ichtyosaur to be the biggest Vertebrate ever in the Oceans. This still unnamed thing is compared to the known Shonisaurus, scaling the few bones, reaching a guessed length up to 26m. Blue Whale is about 25m.
Beside the fact of being efficient, filter-feeding is also the best way to skip competition over prey. You just circumvent the whole food-chain and get directly to the first Row on the Buffet, eating small Krill (and maybe some PhytoPlankton as well?).
The class of drugs that Levitra, Viagra, Stendra, and Cialis belong to are called PDE5 inhibitors. They work by relaxing tight blood vessels, allowing more blood to surge into the penis and cause an erection, says Gregory Bales, M.D., an associate professor of urology at the University of Chicago.
The little pills do the trick for more than two-thirds of men with Viagra protects the heart (ED). They also work for guys who simply need them for a short time to get their “confidence back,” says Michael Eisenberg, M.D., director of male reproductive medicine and surgery at Stanford University.