1. Parrots Speak Better Than We Believe

Studies show that they are not only reproductive of what they hear: parrots have logical thinking and are capable of solving language problems like children aged 4 to 6 years.

Parrots understand the meaning of some words

2. Elephants really have good memory

You may have heard that saying already, and it has a foundation. Although it is difficult to quantify animal intelligence, there is the encephalization quotient, which is the ratio between actual brain size and expected size as a function of the body size of the pet. In man it is from 7.33 to 7.69, in pig it is only 0.27 and in elephants it is 1.88. Weighing almost 5 kg, the brain of the latter can store a lot of memory!

Elephants don't forget things so easily

3. Giraffes have a complex circulatory system.

The height favored the evolution of giraffes, allowing them to feed on vegetation inaccessible to many animals. However, the long neck requires an efficient blood vessel system to make the blood reach the top of your head. The heart needs to beat much harder to pump enough, and the veins below the heart (especially in the paws) need to be thinner so as not to retain vital fluid.

Giraffe's heart needs to be very potent

4. Fish are more likely to change sex

Hermaphroditism is much more common among fish than in any other vertebrate on Earth. Because of this, many species may change sex depending on the hormonal cycle or environmental change. Others, however, keep both their male and female organs to increase the chance of reproduction.

Fish may change sex to allow species to survive

5. Chicks Are Comrade Animals

If you think natural selection produces “selfish” animals, you need to know that chicks practice altruism with their siblings. Noting that it is feeding time, they make a specific sound to call their mates to the rank.

Chicks Call Brothers for Lunch

6. Beavers Have “Bigger” Days

During the winter, beavers avoid leaving their dark burrows by living on previously stored food or their own body fat. Since they rarely leave their burrows and do not see sunlight, their circadian rhythm - the so-called biological clock - ends up with the feeling that the days actually last 29 hours!

Beavers change the biological clock in winter

7. Whales produce up to 50% fat milk

A baby whale spends up to 12 months in its mother's womb to be born about 1/3 her size. To feed their offspring, mother whales contract muscles around their nipples to squirt milk into babies' mouths. And since this milk is up to 50% fat, puppies have a very fast growth.

Whale puppies grow fast because of greasy milk

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