The Holocene Mass Extinction is a fictional mass extinction that occured in the end of the (fictional) Holocene Era and the Cenozoic itself.
Description Of Some Of The Animals Effected During The Extinction
In the East African prairies (in the year 2036), Kenya, a vulture is soaring above the valley during a rainstorm when it spots an unguarded giant shark nest. The featherless bird flies down and consumes several of the hatchlings. Meanwhile, the father giant shark (Carcharodon carcharias) is hunting for prey in the forest when his acute sense of smell alerts him to the intruder at the nest and runs back towards the nest. The vulture is forced to flee when the enraged father giant shark arrives, trying to fly off but its huge wings prevent it from flying in the thick forest. The giant shark repeatedly lunges and tries to kill it. It finally takes off just as the father giant bites the bird's foot. Only one giant shark hatchling survives the carnage.
After a giant shark attacks an elephant before being driven off, a male bison loses a fight for mating rights against another male bison. Two sharks hear the commotion and close in to hunt the loser. Working together, they bring down the bison. In western North America (California), a herd of rhinoceroses is drinking at a watering hole in an oasis. An American common dylanus steals an egg from a rhinoceros nest and flees, but the enraged mother rhinoceros follows the dylanus into a cave. It tries to eat the egg, but the mother arrives, bellowing before the dylanus's partner appears, and the rhinoceros flees, with the dylanus pair racing after it. They manage to bring down the rhinoceros by tearing into its neck with their claws.
Meanwhile, in what is today's West Africa, a herd of giraffes are roaming the plains in search of food while a female lays her eggs without nesting, as a six-mile wide asteroid formed from the collision of two asteroids 200 million years earlier enters the Earth's atmosphere. The asteroid hits the Earth in the Gulf of Africa, creating a massive explosion and sending debris into the air. The explosion heats the air temperature near the crash site to 600° F. Hundreds of giraffes are burned alive. Two minutes after impact, seismic shock waves trigger an 11.1 earthquake, which, combined with a second heat wave from the impact, wipes out the remaining giraffes. Most of their eggs are destroyed but some survive, buried under the cool soil.
The effects of the collision begin to affect the animals in Kenya, with the 11.1 magnitude earthquake rippling through the valley. Falling debris litters the ground and drive animals from the valley. Several bison and elephants are engulfed by a 300° ejecta cloud and burnt to death. Fifteen minutes after impact, the ejecta cloud has spread to the Atlantic Northwest and Indian Northeast and threatens to in-circulate the entire planet in ash. A pair of vultures tries to fly away, but pieces of flaming debris shower the valley. Suffering from burnt wings, the male bird falls from the sky to his death. After trying to save her mate, the also wounded female is forced to land in the valley. The effects of the ejecta also caused lightning storms to strike the valley.
The soaring temperatures create high humidity in the valley and force the bison to keep moving. Many of the dead animals provide plentiful food for the hungry sharks.. The debris create massive fires that devastate forests of the Indian Northeast. In the valley, the air pressure plummets, creating a vacuum that sucks in the raging flames and ignites a firestorm, causing temperatures in the valley to reaches 1800° F. The female vulture stands over her mate's body but panics when the vegetation around it ignites. She manages to take off despite her tattered wings, leaving the dead male behind. Smaller animals hide underground while the larger animals are forced to flee.
In western North America, forty-five minutes since the impact, the ejecta cloud rolls in from the east, increasing the temperature around North America by several degrees every second until it reaches 300°, causing three rhinoceroses and a pair of dylanuses to use a cave for shelter (unenthusiastically with each other as well). The temperatures return to normal after five hours, and the dylanus run outside to feast on a rhinoceros corpse, while two of the surviving rhinoceroses travel to the watering hole. The third stays behind. Soon the ejecta cloud causes a sandstorm, suffocating the two rhinoceroses alive. The pair of dylanuses survive by hiding behind their prey, while the third rhinoceros remains in the cave. A day passes, and the dylanus return to the watering hole, where the last rhinoceros is drinking. The dylanuses are desperately hungry, yet are weak from their ordeal. One of them recklessly attacks the rhinoceros, but the big mammal collapses on top of it, killing it in the process. The remaining dylanus resorts to eating the corpse of its companion.
Four days since impact, food is in short sup across the entire planet. In the Indian Northeast, four bison head towards an island in search of food. The earthquake caused by the impact event forms a huge megatsunami, but also causes the water to recede and form a land bridge to the island. Three of the bison cross the land bridge to the island. The female vulture lands, where it eats a stranded fish, just as the megatsunami builds and races towards the shore. The vulture attempts to take off but is caught into the vast wave and drowns, with the wave subsequently drowning the three bison as well.
Ten days have passed since impact, and few large land animals remain. In western North America, the rhinoceros stays close to the watering hole, but collapses and dies from inhaling hydrogen sulfide that rose from the watering hole. The dylanus runs up to the dead rhinoceros, but it too is killed by the highly poisonous gas.
A month and a half later, in the Indian Northeast, a handful of large land animals patrol the wasteland. A starving but weak elephant finds a small bush, but it’s almost forced to fight over it when a wandering bison appears, until the giant shark arrives. The giant shark loses an eye to his prey's horn, but he manages to break off one of its horns and kills it by simply lunging and biting down hard on the neck. The shark then turns his attention to the elephant and after being struck in the right leg, flips it over and rips out its throat. He heads back to the dead bison, but trips over the elephant's tusks and is impaled on the bison's remaining horn through the neck. In West Africa, a giraffe baby emerges from an egg that was sheltered away in the ground. All around the world, small handfuls of large land animals try to start over, but their species are beyond hope for replenishing their numbers. In the end, inbreeding, disease, and starvation will wipe out their populations until a single giraffe remains, only to die in the wasteland too, and it only took 66 million years to bring these large land animals to this catastrophic point in their evolution.
But life on Earth was not completely destroyed: crustaceans, snails, slugs, cephalopods, fish, amphibians, turtles, and crocodiles surviving underwater; small rodents and insectivorous mammals, snakes (extinct 20 million years later from competition), insects, arachnids, and lizards hid underground; birds and bats flew or swam away from the disaster; vampires, especially Owari No Seraph vampires had immortallity and flourished (but millions of years later died out due to competition with newer animal species). Three years pass before sunlight finally reaches the planet again, and plant life finally carpets the Earth again, setting the stage for a new era: the era of birds. Birds now multiply and diversify, with countless species of birds evolving, until 550,000 species explode across the planet and one species, xerans, the sapient tool-using civilized birds, eventually rule the planet like the large mammals once had.