Climate change is making our oceans more acidic, threatening most marine animals. Conversely, jellyfish thrive in warmer waters, posing a risk of ocean takeover if climate change remains unchecked.

Help protect our oceans. Join Oceana: https://bit.ly/2kA7bTV

Nudibranchs, a type of sea slug, are renowned for their vibrant colors, which they acquire from their diet.

Discover more about these fascinating creatures in Oceana's Marine Life Encyclopedia.

Sea stars are not always docile. The sunflower sea star, the ocean's fastest and largest, is a formidable predator, capable of eating almost anything in its path.

Join Oceana to help protect incredible animals like the sunflower sea star. Learn more here: https://bit.ly/2lEjmPU

California sea lions swim at top speeds of 25 miles per hour, making them the fastest among all seals and sea lions.

For more fascinating facts about these marine mammals, explore Oceana's Marine Life Encyclopedia: Oceana's Marine Life Encyclopedia.

Coral reefs are among the planet's most diverse ecosystems, akin to rainforests. Despite covering less than 1% of the seafloor, they sustain over 25% of all marine life.

However, these vital ecosystems are severely threatened, particularly by plastic pollution. Join Oceana to help protect them: #BreakFreeFromPlastic.

Three Southern Resident orcas are presumed dead, further diminishing their critically endangered population. Only 73 individuals now remain in this struggling pod.

Oceana is dedicated to protecting these starving orcas. Join us to support their survival efforts.

Learn more and get involved: https://bit.ly/2kyNITF

Elephant seals undergo a rapid "catastrophic molt," shedding their entire coat quickly. This unique event highlights their vulnerability and the need for ongoing protection.

These molting seals, and all marine mammals, require our support. It's crucial to safeguard them from legislative changes that could weaken existing protections.

Contact Congress today. Tell them to #DefendMarineMammals and oppose any modifications to the Marine Mammal Protection Act. Take action here: https://bit.ly/2NtJ8Ch

Despite its small size (8-10 inches), the blue-ringed octopus is one of the planet's most venomous animals. Its bright blue rings serve as a clear warning to potential predators.

Learn more in Oceana's Marine Life Encyclopedia.

Manta rays perform graceful barrel rolls when they find a hot spot for food.

Learn more about these majestic animals in Oceana's Marine Life Encyclopedia: Oceana Marine Life Encyclopedia.

Pufferfish, recognized for their endearing smiles, conceal a deadly secret: tetrodotoxin. This potent neurotoxin makes them one of the ocean's most dangerous creatures.

Discover more about pufferfish and a wide array of other fascinating marine life in Oceana's comprehensive Marine Life Encyclopedia.

The Portuguese man o' war is not a jellyfish. Instead, it's a siphonophore, a colony of tiny animals functioning as a single organism.

Discover more about these unique marine animals in Oceana's Marine Life Encyclopedia: https://bit.ly/2HfVI44

Bioplastics are often marketed as an eco-friendly alternative to traditional plastics. However, this "green" image can be misleading. Many bioplastics are not compostable and cause similar environmental harm, particularly in oceans, as their petroleum-based counterparts.

It's crucial to recognize that not all bioplastics offer a sustainable solution. To truly combat plastic pollution, we must move beyond all forms of plastic.

Join the #BreakFreeFromPlastic challenge here: https://bit.ly/2z3DPkh.

Leatherback turtles, ancient creatures dating back to the age of dinosaurs, are now critically endangered.

A significant new threat comes from plastic pollution. These plastics often resemble jellyfish, the turtles' primary food source, leading to accidental ingestion and severe harm.

Help protect leatherbacks. Take the pledge to #BreakFreeFromPlastic: https://bit.ly/2MgW2Uj

Cigarette filters, often called the "last acceptable form of littering," are a major source of plastic pollution. Made from cellulose acetate, these filters release plastic, nicotine, heavy metals, and other toxic chemicals into waterways and oceans, posing a significant threat to our health and the planet.

National Geographic explores this critical issue and potential solutions. Learn more about this widespread plastic pollution by subscribing to National Geographic or reading "Cigarette butts are toxic plastic pollution. Should they be banned?" here.

Sharks are vital indicator species for coral reef viability. Without them, fish populations can go unchecked, causing significant damage and threatening the delicate balance of these crucial marine ecosystems.

Join Oceana in demanding a #FinBanNow to protect sharks and ensure the health of our coral reefs. Support the initiative here: Oceana Fin Ban

A young bottlenose dolphin mother has adopted and is caring for a melon-headed whale calf. This unusual interspecies adoption showcases a remarkable bond in the marine world.

Researchers are uncertain why the dolphin chose to nurture a calf from another species, but they speculate it may be due to empathy for the orphaned whale.

Support marine life protection. Join Oceana to help safeguard dolphins and other ocean creatures: Oceana.

#SharkWeek 2019 is more than a celebration; it's a crucial opportunity to protect these magnificent creatures.

Sharks face severe threats from overfishing, with fins from up to 73 million sharks entering the global fin trade annually. This unsustainable practice devastates shark populations worldwide.

It's time to act. Support a #FinBanNow to safeguard sharks for future generations. Learn more here: https://bit.ly/2YxN3UF

The world's oceans are already drowning in plastic trash. Instead of stemming this pollution, plastic manufacturers aim to dramatically increase U.S. plastic production over the next decade.

Take action: https://biodiv.us/2K38a81

Sea turtle nesting in the U.S. Southeast has reached record numbers. This success stems from crucial initiatives like protecting habitats, upholding the Endangered Species Act, and enforcing Turtle Excluder Devices (TEDs) on trawl boats.

Join Oceana to help save sea turtles: https://bit.ly/30O3Ksr

Eleven Genie's dogfish were observed feasting on a swordfish.

However, the situation quickly reversed when a wreckfish appeared, transforming these predators into its own prey.