Saturday snoozin' or soakin' up the sun? ☀️ These California sea lions really know how to do both!
We are wishing you a beautiful Spring weekend from all of us at NOAA's Office of National Marine Sanctuaries. How are you spending your Saturday?
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Weirdo Wednesday!
Welcome back to Weirdo Wednesday! Today we are talking about...
The Risso’s Dolphin - Grampus griseus
Believe it or not, these weirdos start off gray/olive brown when they are babies. So why do they look white? That is the result of scarring from one of their favorite snacks, an animal that does not go down easy; deep sea squid. They are incredible hunters despite only having 7 pairs of teeth on their bottom jaw and none on the top. While thought to be specialist, studies done by MBARI show that they are more generalist eaters, enjoying fish and crustaceans as well as squid.
This is a dolphin?
Not all dolphins have the long beak. Risso’s dolphins are the second largest species of dolphin at about 14 feet long (the first being Orcas of course). They are also sometimes grouped in the ‘Blackfish’ category, which includes pilot whales and false killer whales. They’re identified by their round head and their sickle-shaped dorsal fin, but also despite having a wide range, these weirdo’s are not seen very often. I myself was lucky enough to see 2 pods off the coast of Monterey Bay, but this is because they are deep sea dolphins who can dive up to 1000 feet and stay down for 30 minutes!! Another reason may be that they can easily be confused for orcas by locals.
Threats
The biggest threat to these weirdos is similar to most marine mammals, and that is entanglement. Gillnets, longlines and trawls are their biggest issues. Another issue that most cetaceans face is noise pollution. Whales and dolphins use sound to communicate and find food, and ships are very noisy. Pods that live around highly populated ports have a hard time communicated with each other in the water during dense shipping times. This can lead to damage in their hearing, and even ship strikes. NOAA has reported between 2016-2020, 119 whales were found beached and the cause of death was ship strikes. While that may not seem like a lot, keep in mind scientists don’t get to autopsy whales that don’t get beached and instead sink to the bottom of the seafloor.
They are performers!
These acrobatic weirdos do an array of tricks including breaching, spyhopping (vertically poking its head out of the water) and slapping its tail flukes, bodies (shown above) or pectoral flippers on the sea surface. A particularly famous Risso’s dolphin named “Pelorus Jack” became famous for guiding boats across Cook Strait in New Zealand. They are very social, often seen in pods of 30 dolphins or in larger super pods, and they have even been seen temporarily joining a pod of Pacific White-sided dolphins.
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Monterey Daily Cypress, California, October 31, 1918
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🚨 Invasive species alert 🚨
This large, golden-brown kelp species, Undaria, is native to Japan, Korea, and China. So, how did it end up in Monterey Bay National Marine Sanctuary? Undaria frequently catches a ride around the world on boat hulls or in ballast water. Upon arrival to a new area, if weather conditions are right, it can cling to new boat hulls, clog docks, smother fishing gear, disrupt marine farming, or even alter marine ecosystems. Due to its catastrophic affects, Undaria is considered one of the world's worst invasive species.
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Brian Jones introducing Jimi Hendrix at the Monterey International Pop Festival, 1967
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Harbor seals hauling out at Hopkins Beach, CA
Hauling out is an important for seals because it is when they can rest, give birth, and molt. This time out of the water allows them to use the sun to keep warm instead of relying on their fat and metabolism. This becomes really important in colder waters like Alaska. If harbor seals can’t haul out, they must supplement their heat loss by eating more. If you see a harbor seal on the beach like this, let them rest for a bit. They’re easily startled, and we don’t want them to have to look for extra food because they didn’t feel like the beach was a safe place to rest at that time.
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A sea otter pup dives in pursuit of its mom, who’s foraging under a red tide off Monterey, California.
PHOTOGRAPH BY @RALPHPACE
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[THIS IS JUST SHREDDED CHEDDAR AND MONTEREY. BUT ANYTHING WORTHWHILE IS TOUGH. AND THEN I ADD MORE CHEESE. IT'S A 4-CHEESE BLEND.]
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