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9 Facts That Will Change How You Think About Sharks

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9 Facts That Will Change How You Think About Sharks
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By Jen Sawada

Sharks have been around for 400 million years, before the time of the dinosaurs, but there's much more to them than big teeth and summer blockbusters. Consider these facts, which will change what you think about sharks.


No Need to Fear the World’s Biggest Shark

Andre Seale

Whale sharks are gentle giants of the ocean, often growing as long as 40 feet. They swim with their mouths open to filter-feed on small fish, invertebrates and plankton. While whale sharks aren't seen on Shark Week as often as jagged-toothed great whites are, they do attract large audiences of divers—contributing about $47.5 million worldwide each year.

Some Sharks Can Walk

There's a shark species found off the coast of Indonesia that doesn't just swim around. It gets from place to place by walking on the ocean floor.

Rays Are Flat Sharks

Christian Grondin

Though they look different, rays are closely related to sharks—so closely, in fact, that they're often referred to as flat sharks. These species have cartilage skeletons and float through the water thanks to their oil-rich liver—not the swim bladder on which other fish rely. Mobula rays, pictured above and manta rays have received protections through the Convention on International Trade in Endangered Species of Wild Fauna and Flora.

This Shark Has Many Names—Just Don’t Call Him ‘Jaws’

iStock

You've heard of a great white shark, but what about a white or blue pointer? Turns out, they're all the same species! In Australia, the world's most famous shark is called a white pointer, while in South Africa, it's a blue pointer.

Greenland Sharks Are the World’s Longest-Living Vertebrate

NOAA Okeanos Explorer Program

Last year, scientists discovered a Greenland shark estimated to be 400 years old. That makes this species the oldest known living vertebrate. These slow-growing sharks don't reach reproductive age until around 150, so it's fortunate that they have a long life span to make up for lost time.

Many Sharks Give Birth Like Mammals

Have you ever seen a shark give birth? This may come as a surprise, but many shark species give birth to live young instead of laying eggs. That makes them more like mammals than other fish. Researchers released a video in 2015 of what they think is the first thresher shark birth caught on camera.

Blue Sharks Top the Fin Trade

iStock

These sleek indigo sharks are found in nearly all the world's oceans—and are also the most caught. About 20 million blue sharks are killed every year, most of them for their fins. This heavy fishing has caused their numbers to drop sharply. Fortunately, Samoa and Sri Lanka have proposed giving blue sharks protections through the Convention on Migratory Species (CMS). Other shark species that could receive protections through CMS this year are whale sharks, dusky sharks, wedgefish, guitarfish and angel sharks.

Sharks Prove You Can Go Home Again

Shutterstock

There's no place like home. There's no place like home. Sharks don't have ruby slippers to help them get home, but some species have an amazing innate ability called philopatry, the tendency to return to where they started their lives. Female lemon sharks, for example, swim all the way back to where they were born in The Bahamas to give birth to their young. The island chain is one of 15 shark sanctuaries worldwide, where sharks are safe from commercial fishing.

There Are Some Very Surprising Sharks in the Sea

It's a coral! It's a carpet! It's a … shark? The tasseled wobbegong is one of the more unusual sharks in the ocean, but this bottom-dweller isn't the only unexpected species swimming around reefs. There are more than 500 species of sharks in the world's oceans—and there may be many more that scientists still have not identified.

Jen Sawada is an officer for Pew's global shark conservation campaign, managing efforts to encourage countries in the Pacific and Caribbean to adopt domestic measures to protect sharks, including creating shark sanctuaries.

A plume of smoke from wildfires burning in the Angeles National Forest is seen from downtown Los Angeles on Aug. 29, 2009 in Los Angeles, California. Kevork Djansezian / Getty Images

California is bracing for rare January wildfires this week amid damaging Santa Ana winds coupled with unusually hot and dry winter weather.

High winds, gusting up to 80- to 90 miles per hour in some parts of the state, are expected to last through Wednesday evening. Nearly the entire state has been in a drought for months, according to the U.S. Drought Monitor, which, alongside summerlike temperatures, has left vegetation dry and flammable.

Utilities Southern California Edison and PG&E, which serves the central and northern portions of the state, warned it may preemptively shut off power to hundreds of thousands of customers to reduce the risk of electrical fires sparked by trees and branches falling on live power lines. The rare January fire conditions come on the heels of the worst wildfire season ever recorded in California, as climate change exacerbates the factors causing fires to be more frequent and severe.

California is also experiencing the most severe surge of COVID-19 cases since the beginning of the pandemic, with hospitals and ICUs over capacity and a stay-at-home order in place. Wildfire smoke can increase the risk of adverse health effects due to COVID, and evacuations forcing people to crowd into shelters could further spread the virus.

As reported by AccuWeather:

In the atmosphere, air flows from high to low pressure. The setup into Wednesday is like having two giant atmospheric fans working as a team with one pulling and the other pushing the air in the same direction.
Normally, mountains to the north and east of Los Angeles would protect the downtown which sits in a basin. However, with the assistance of the offshore storm, there will be areas of gusty winds even in the L.A. Basin. The winds may get strong enough in parts of the basin to break tree limbs and lead to sporadic power outages and sparks that could ignite fires.
"Typically, Santa Ana winds stay out of downtown Los Angeles and the L.A. Basin, but this time, conditions may set up just right to bring 30- to 40-mph wind gusts even in those typically calm condition areas," said AccuWeather Senior Meteorologist Mike Doll.

For a deeper dive:

AP, LA Times, San Francisco Chronicle, Washington Post, Weather Channel, AccuWeather, New York Times, Slideshow: New York Times; Climate Signals Background: Wildfires, 2020 Western wildfire season

For more climate change and clean energy news, you can follow Climate Nexus on Twitter and Facebook, sign up for daily Hot News, and visit their news site, Nexus Media News.

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