Extinction

When many animals die out and no longer exist, we say that they have become extinct.

This story was created for the Google Expeditions project by Vida Systems, now available on Google Arts & Culture.

Extinction by Vida Systems

More than 99% of all the species that ever lived on earth are extinct. Mass extinctions are relatively rare events; however, extinctions of certain species are common.

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Extinction

There are many reasons for animals to go extinct. Natural disasters like earthquakes, volcanoes and giant meteorites hitting the Earth are just some of them. There have been 5 mass extinctions on Earth. Scientists claim that now we’re facing the sixth one.

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Meteorites

Meteorites are asteroids so big that they survive the scorching heat while hurtling through Earth’s atmosphere and hit the ground. If an asteroid vaporizes during its fiery passage through the air, it becomes a meteor. This is what we actually call a shooting star!

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Dinosaurs

Many theories exist about the reason they became extinct. Most experts believe the cause was either a cooling of the climate, plate tectonic movement, or massive volcanic activity.

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Some scientists think that 65 million years ago a 6-mile-long meteorite killed 70% of Earth’s species, including dinosaurs.

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Hunted to Extinction

Humans are wiping out species much faster than nature creates them. Scientists claim that the sixth extinction is already in progress.

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The main reasons for it are: habitat destruction, invasion, pollution, human overpopulation, hunting, fishing, and gathering way above our actual needs.

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Oil Spillage

Oil spills can cause the death of thousands of fish, many of which are already on the endangered species list. They also affect seabirds because the oil sticks to their feathers and they aren’t able to fly.

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Why do Animals Go Extinct?

Throughout the 3.5 billion years that Еarth has hosted life, extinction has proven to be a natural life process. Billions of species have roamed the Earth in various sizes and numbers, and today only 1% of the species that have ever lived are said to be alive.

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The Mammoth

Disappeared from Earth about 4500 years ago.  The prevailing theory is that a warming of the climate contributed to the decline of the species.

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Тrilobites

Were a very successful arthropod, roaming the oceans for 270 million years before they became extinct 250 million years ago.

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The Coelacant

Was seen as a living fossil as their last fossil record dates back 66 million years. However, in 1938 it emerged again to much scientific delight. It’s called a Lazarus Taxon when a species disappears from the fossil record only to reappear millions of years later.

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Extinction Timeline

Over the course of its 3.5 billion years of life, Earth has seen 5 periods of mass extinctions when incredible amounts of species have been annihilated.

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 As all of these events happened millions of years ago, it’s difficult to determine the exact causes for each of these extinctions. We mostly think that they happened because of a gigantic bout of volcanism, an asteroid hitting the Earth, or extreme climate change.

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Ordovician-Silurian Period

The Ordovician-Silurian Period actually consists of 2 isolated extinction events, separated by thousands of years. They happened 440 million years ago. They destroyed most sea creatures, and scientists think it was due to an ice age that substantially lowered sea levels.

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The Late Devonian Extinction

365 million years ago, 75% of all species died out, mostly marine species. The Late Devonian extinction was due to not 1 but many events that happened over a period of 3 million years, which scientists generally attribute to climate change.

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The Permian Mass Extinction

Is known as the Great Dying as it was the most extreme extinction Earth has ever witnessed. 96% of all living things died out and the cause is thought to have been a cataclysmic volcano that with the help of bacteria, produced massive quantities of lethal methane gas.

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The Triassic Jurassic Mass Extinction

Was the fourth extinction. It had 3 phases of mass extinction, which killed 20% of all marine life and all non-dinosaur archosaurs.

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The Cretaceous-Tertiary Mass Extinction

Is the fifth and most famous extinction as it is the destroyer of the dinosaurs. This happened 65 million years ago and killed about 50% of all species on Earth. It is attributed to either incredible volcanic activity or a gigantic meteorite hitting the Earth.

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Geological Timeline

Scientists say we are in the sixth and most devastating of all extinctions, the Holocene extinction. Through deforestation, over-fishing, hunting, and general pollution of the planet, humans are the largest contributor to the fastest extinction yet.

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In 1994, biologists predicted that by the year 2030, 20% of all species would be extinct, and, in 100 years, humans would have eliminated 50% of all species. In fact, human impact is increasing Earth’s natural extinction rate by between 100 and 1000 times.

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Why Did the Dinosaurs Go?

65 million years ago all the dinosaurs were wiped off the Earth. Not only the dinosaurs but many sea animals, such as hard shell creatures, sharks, and plankton, disappeared for good. All in all, almost 50% of all living animals became extinct.

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Volcanic Eruption

One plausible theory involves a gigantic volcanic eruption. It would have created a sky laden with ash or debris and starved the Earth of enough sunlight for photosynthesis to function, destroying food sources for many animals.

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Meteorite Strike

Another theory is a meteorite strike on Earth, which also would have filled the sky with ash and debris. However, both theories do not explain how selective this extinction was. Mammals survived the extinction as did many birds, snails, and starfish.

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This mass extinction officially ended the Cretaceous period where dinosaurs ruled supreme. It sparked the next period, the paleogene, the time of the mammals.

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Manmade Extinction

Some notable extinctions have occurred in recent history. Species like the dodo, the Atlas Bear, and the Japanese Sea Lion all fell off the face of the Earth in the most tragic of ways.

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The Dodo

A flightless bird, inhabited the tiny African island of Mauritius. One day in the 17th century, Portuguese explorers visited and the dodo saw no reason to be afraid.

Dodo skeleton, Raphus cucullatusRoyal Ontario Museum

The explorers delighted in not only holding the dodo, but enjoying him as a tasty meal and the last dodo died in 1681, less than a century after its discovery.

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The Atlas Bear

The only African bear, met a similar peril. In the time of the Roman Empire, it would be transported to Rome to be used as an opponent against gladiators and a gruesome executioner of criminals. Hunted repeatedly during the Middle Ages and in the mid-1800s, deforestation eventually led to its end.

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The Japanese Sea Lion

Was abundant along the coasts of Japan and Korea and would breed on their beaches every mating season. These animals were killed for their skin to make leather, bones for magic medicines, and fat for oil.

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The Japanese killed about 3000 of these animals yearly until the 1900s when an attempt to protect them was made. Efforts were futile and the last Japanese Sea Lion died in the 1950s.

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Keystone Species: Honeybee

A keystone species is what we call a species that a large amount of other species rely on to stay alive. Bees are one of those.

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Einstein famously said about them: “If the bee disappeared off the surface of the globe, then man would only have 4 years of life left, no more bees, no more pollination, no more plants, no more animals, no more man."

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Honeybees

Honeybees are responsible for pollinating a third of the world’s food, not only for humans but for animals as well. In the last 10 years, however, there has been a sharp decrease of 30% in honeybee population worldwide. Without honeybees, our Earth will lose millions of species.

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