David Attenborough's Natural Curiosities: Season 4

Bamboo grows to its full height in the first few weeks, literally 1 meter per day (can be observed in real life!), and then stops growing forever: both in height and breadth.
Bamboo is native to Japan and China, and it was introduced to other regions of the world as an ornamental plant. But it blooms all over the world at the same time, very rarely, different species - once every 30-40 or even 110 years! At the same time!
Does he know how to count the years??? Or is it a genetic memory?

(DOC. about NATURE. Unintentional selection)
Pizzley (a cross between a polar bear and a grizzly) inherited from the white the habit of stomping with his front paws. This is how polar bears break through the ice beneath them in search of seals.

European bees are very fastidious. They choose the flowers that produce the best and sweetest nectar. African bees have to feed when there are very few flowers around. They are very efficient and aggressively defend the hive.

African bees sting no more than European bees, but they attack almost the entire colony, thousands of individuals.

In Africa, elephants are scared away from sites by broadcasting the hum of swarming bees.

(DOC. about NATURE. Orientation)
In sunny weather, pigeons navigate by the sun. On cloudy days, use a magnetic compass. In the photo, yellow shows their path over the highway to the house. Released later away from the highway, they first found it, and then moved towards the house. They are the localities they are

Only 10% of dung beetles roll clods of manure. The rest take refuge either in it or in the ground beneath it. A beetle can roll a ball that is 60 times heavier than its body. The beetles roll the lump in a straight line from the pile (rather than towards some landmark), as this allows them to move away from competitors faster. Then he adheres to this path, correcting his movement along the sun.

Nocturnal dung beetles living in the Southern Hemisphere are able to navigate at night by the plume of the Milky Way (as well as by the moon), but they do not distinguish individual stars.

(DOC. about NATURE. The extreme size of the cubs)
The digestive system of pandas is not adapted to assimilate plant food alone. Their intestines are short. Only 20% of calories are absorbed by bamboo pandas. It affected their metabolism. Movement became slow, and mating (and breeding) became rare. Females are ready to mate only once for 1-2 days a year.

The ancestors of the emu (Australian ostrich), moa (extinct ostriches of New Zealand) and kiwi (New Zealand) are different. Kiwi fruit in several It is several times smaller than ostriches, but kiwi and emu eggs are the same size. There is such an explanation. As a rule, birds lay eggs as soon as possible so that they do not interfere during flight. Wingless kiwis do not have this problem, this egg crushing factor does not affect them. If there are no predators nearby, then you can raise one chick, which will be born already well-formed.

(DOC. about NATURE. Shells and shells)
On an arid island in the Galapagos, it is more difficult for turtles to reach the leaves than on neighboring islands. Therefore, the shape of their shell is convenient for feeding with an upstretched neck.

The differences in egg shape are related to the hatching characteristics, regardless of where the nest is located. Eggs pointed on one side, like those of auk and kire, will not only heat up faster, but also lose heat. Spherical eggs lose less heat and are more difficult to heat, but when laid with other eggs of the same type, their shape is optimal.