When it comes to crocodiles, some friends may say: crocodile, isn't that a big guy similar to a lizard contemporary with dinosaurs? Today, the crocodile Zhen Xiaobian will reveal the secret for you, the unknown and rare side of this big guy.
Crocodile, it is not a fish, is the oldest reptile with dinosaurs more than 200 million years ago, and is also one of the most primitive animals living so far, super adaptable, extremely vigorous, so it is a well-deserved "living fossil".
First, farmed crocodiles are "as timid as rats"?
Little friends who have seen the animal world know that crocodiles have amazing bite power, copper walls and iron walls, sharp teeth, in swamps and rivers, it is simply an overlord-level existence!
However, the crocodile, which looks very fierce, is actually a coward! The crocodiles in the crocodile breeding base fully illustrate this point, the bite force of crocodiles is amazing, generally more than 2,000 pounds, but the habit of crocodiles is that they are very timid, and they should be kept still during the feeding process and do not disturb them. It can also not be fed every day, it should be fed once in 3-5 days, and it should be quantified when feeding. It seems that the crocodile looks like a big man on the surface, but inside it is a cute girl who "has a tiger in her heart and sniffs roses".
Second, Nani, crocodiles turned out to be hermaphroditic?
Those who have studied biology know that the birth of boys and girls is determined by the chromosomes of sperm, and I never expected that this set of genes would not work here in crocodiles!
Crocodile eggs are first laid male and female, and when hatching, the crocodile sex is determined by temperature. (Nani? This is simply beyond our understanding, isn't it? ）
When the temperature of the nest is 32-33 degrees Celsius, male crocodiles hatch. When this temperature is exceeded or lowered, a female crocodile hatches. And when the temperature from the top of the nest to the bottom is different, two crocodiles will hatch. (I have to say that it is so powerful, no wonder it can survive on the earth for more than 200 million years)
Third, the Internet celebrity Yangzi crocodile turned out to be a tease?
Recently, the Yangzi crocodile, a unique first-class protected animal in the mainland, stood out among the crocodiles and successfully came out of the circle, and was known as the "little cutie of the crocodile world".
When it comes to crocodiles, it is a terrifying existence, the mainland's indigenous Yangzi crocodile is not an unusual road, looks like a clear eyebrows, well-behaved, and because of the sand sculpture, it has been unanimously sought after by netizens.
The daily life of the Yangzi crocodile is very happy, eating small fish and shrimp every day, basking in the sun, loving to watch the grandmother wash clothes, knocking on its head with a mallet, and it swims away happily and meekly. Like children, he loves to eat Wang Wang snow cakes, and a piece of snow cakes must be divided into three bites to savor, tied with the goose, and was chased by the butt.
Other crocodiles are fierce and ugly, and if they don't agree with each other, they will come to a death roll, and the Yangzi crocodile, the appearance is cute and cute, except for the short legs, everywhere is round, and if they are bullied, they will only bark, try to ask, who can refuse such a cute and funny Yangzi crocodile?
Fourth, crocodiles can change their teeth 50 times in their lifetime
People can only change their teeth once in their lives, and when it comes to crocodiles, it has reached an astonishing 50 times!
Teeth are vital to crocodiles, both as their feeding tool and as their main weapon, and after more than 200 million years of evolution, crocodiles' old teeth will periodically fall out, grow strong and sharp new teeth, and have the ability to change teeth for life.
The reason for this strong renewal ability is because the crocodile's dental plate plays a key role, providing stem cells that support the continuous growth of the tooth. According to statistics, crocodiles can regenerate an average of 3,000 teeth in their lifetime, such as long-lived alligators, with 80 teeth in their mouths, each tooth can be replaced up to 50 times, and 4,000 teeth can be replaced in a lifetime! Isn't it super amazing?
Upcoming Period
In the crocodile world, polyandry is practiced? And the crocodile is full with a meal, and it can carry it for three years ... In the next issue, we will bring more crocodile fun and cold knowledge, so stay tuned
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