For every human, there are 1.6 mn ants: More such facts about animals

March 3 is celebrated as World Wildlife Day since 2014 to raise awareness about global flora and fauna and their conservation. On this occasion, let us look at lesser known facts about some animals.

One species of jellyfish, called the Turritopsis Dohrnii, is immortal. It has the ability to revert to its child state after becoming sexually mature, therefore it never dies. Credit: NYT/Representative Image

Snails can sleep in hibernation for up to three years. They need moist weather to survive. If their environment does not agree with them, they sleep up to three years to escape warm climates. Credit: Getty Images

African elephants have a special alarm call when they sense a danger by humans. A study in Kenya showed that elephants had a distinctive low rumble when running away from humans. Credit: Reuters Photo

The now extinct giant penguin, which lived more than 35 million years ago, was the largest ever, roughly 250 pounds in weight and 6 feet 6 inches tall. This would be as tall as Lebron James. Credit: Reuters Photo

The arctic reindeer is the only mammal on earth that changes eye colours in different seasons. During summers, its eyes are a dazzling golden, while in winter, its eyes become dark blue to help its vision in low light. Credit: WikiMedia Commons

It may be hard to tell looking at full grown pandas, who weigh as much as 150 kgs and are 1.5 m long, but at birth, a panda is smaller than a mouse and weights about 4 ounces or 100 gms. Credit: AP Photo

King cobras can inject as much as 7 mililitres or roughly 1.5 teaspoons of venom in its victims with a single bite. A miniscule quantity, like two-tenths of a fluid ounce, is enough to kill 20 people, or even an elephant. The venom directly affects respiratory centres in the brain and causes cardiac failure. Credit: iStock Images

To prevent themselves from floating away from each other in the sea, sea otters hold hands when they sleep. They also entangle themselves in giant seaweed to get some anchorage. Credit: iStock Images

A blue whale, the largest animal on earth, grow more than 100 feet long and can weigh as much as 30 elephants. A blue whale can weigh about 90,000 to 136,000 kg. Credit: Reuters Photo

There are over 10 quadrillion ants on Earth. Scientists estimate that there are roughly 1.5 million ants for every human on Earth. Credit: iStock Images