The Great Hammerhead Shark lives in tropical and temperate seas, typically at depths of 80 to 300 meters. It can be found along the eastern and western coasts of Africa, Australia, Western Europe, North America, and Japan. Today, it is critically endangered, with fewer than 200 individuals estimated to remain worldwide. Through Mareon, this unique species will continue to live on the blockchain — We won’t forget it. We will protect it.

The North Atlantic Right Whale inhabits the cold coastal waters of the North Atlantic Ocean and can survive in both deep and shallow environments. But today, climate change, ship strikes, fishing gear entanglement, and increasing ocean noise pollution caused by human activity are putting the species at severe risk. Listed as endangered since 1970, the population has now declined to fewer than 350 individuals, with fewer than 70 breeding females remaining. Experts warn that without human intervention, this iconic species could go completely extinct within 20 years. But through Mareon, the Right Whale will live forever on the blockchain. Its voice will continue to echo through the chain.

Great white sharks inhabit temperate and tropical waters, particularly off the coasts of South Africa, the North Atlantic, the North Pacific, Australia, New Zealand, and Hawaii. Sadly, this iconic species is now under severe threat from sport fishing, the trade in fins and teeth, accidental bycatch, and the decline of prey species within the food chain. Often portrayed as a symbol of fear in popular culture, the great white shark is in fact crucial to maintaining oceanic balance. Today, the global population is estimated to be fewer than 3,500 individuals. But with Mareon, the great white shark will live on the blockchain as a symbol of awareness — Not feared, but remembered with purpose.

The Mediterranean monk seal breeds in just four countries worldwide: Turkey, Greece, Mauritania, and Portugal’s Madeira Islands. Although they spend most of their lives at sea, these seals come ashore to rest, give birth, and nurse their pups. They rely on quiet, remote, and undeveloped rocky shores — but these areas are under intense pressure due to increasing human encroachment. Hunting, deliberate killings, habitat loss, and degradation of their marine ecosystems have pushed the species toward extinction. Once a source of mythological inspiration, only an estimated 600 to 700 individuals remain globally. But through Mareon, the Mediterranean monk seal will be eternally preserved on the blockchain. Its silent cry will now echo across the chain.

There are two subspecies of the West Indian manatee that are currently endangered: Trichechus manatus manatus and Trichechus manatus latirostris. These gentle giants can live in both saltwater and freshwater environments, feeding primarily on aquatic plants. The estimated global population of manatees is around 13,000 individuals, with nearly half being the Florida manatee, which inhabits the southeastern United States and areas around Puerto Rico. Thanks to Mareon, these calm and harmless creatures will find an eternal home on the blockchain. Their quiet existence will echo through the digital chain.

The Devil Ray is a graceful and rare marine species found across the central and western Pacific Ocean, the Mediterranean Sea, and the Atlantic waters. Although protected by special laws in Italy, Croatia, and Albania, this species remains at serious risk due to frequent bycatch incidents caused by intensive fishing activities, especially in the Mediterranean. Despite being listed under the Bern and Barcelona Conventions, its population has seen a sharp decline. It is now estimated that fewer than 3,000 individuals remain worldwide. Through Mareon, the silhouette of the Devil Ray will forever ripple across the blockchain — The spirit of the seas will continue to live on in the digital realm.

The blue whale, the largest animal on Earth, is also one of the loudest creatures in nature. Its low-frequency calls can travel hundreds of kilometers to communicate with other whales. Yet despite the vital importance of this communication, one of their biggest modern threats is underwater noise pollution caused by humans. Increased ship traffic, industrial noise, and sonar activity make it harder for whales to navigate, find mates, and survive. Found in all major oceans except the polar regions, today’s estimated global population of blue whales is between 10,000 and 25,000 individuals. But with Mareon, the voice of the blue whale will never be silenced on the blockchain — Its echo will live forever in the digital sea.

Among all extinct ocean species, none is more iconic or widely recognized than the giant Megalodon. Estimated to be 20 to 50 times larger than today’s great white sharks, the Megalodon likely measured 50 to 60 feet in length and weighed between 105,000 and 227,000 pounds. For comparison, the largest great whites today reach around 5,000 pounds and 15–20 feet in length. A standard bowling lane is about 63 feet long — roughly the size of a full-grown Megalodon. This prehistoric predator went extinct approximately 2.6 million years ago during the Pliocene epoch. While climate change played a role, recent studies suggest that competition from early great white sharks may have accelerated their extinction — especially by preying on juvenile Megalodons and smaller whales. It may no longer roam the oceans, but thanks to Mareon, the Megalodon will claim its place in digital history. A true giant, preserved forever on the blockchain.