Top 10 nature factsNature quiz
How do baby birds get oxygen inside their eggs?
Oxygen comes in through pores in the shell. Directly under the shell, there is a small pocket of air. The microscopic pores on the egg surface allow the CO2 to escape and fresh air to get in, so a developing bird can breathe.
Which dogs are known to eat fish?
Dingos ancestors that were brought to Australia were relatively undomesticated and closer to wild Asian gray wolf. The dingo's diet includes bandicoots, rodents, echidnas, crabs, fruits, and other plants, as well as insects (mostly beetles). On Fraser Island, dignos often eat fish.
Okavango river is famous for its biologically rich delta. What is the river's outlet?
It doesn't have an outlet to the sea. Discharging to an endorheic basin, the Okavango does not have an outlet to the sea. Instead, it empties into a swamp in the Kalahari Desert, known as the Okavango Delta or Okavango Alluvial Fan.
Why do cats have vertical pupils?
To better see in the dark. The sharpest image is produced by round pupils, and if cats weren’t nocturnal, they probably would have round pupils like us. But the vertical pupil, in combination with horizontal eyelids, gives the cat greater and more accurate control in different types of lighting. A cat may adjust the amount of light by moving eyelids only.
Mules are generally known to have fertility problem. How often do mules give birth to a healthy offspring?
Very rarely. Mules are considered infertile, but there have been more than 60 documented cases of foals born to female mules around the world (some of them were even DNA-tested to verify the motherhood). There are no recorded cases of fertile mule stallions.
Is this a male, or a female cat?
A female. This kind of coat coloring, which combines two colors other than white (black and red in this case), is known as tortoiseshell, and it is found almost exclusively in female cats. This is because the X chromosome determines the color of the cat, and there are no color genes in Y chromosome. Thus, female cats with XX chromosomes may be three colored (including white), while male cats with XY chromosomes cannot. (with the exception of very rare XXY sterile males).
Which rodent has the highest ratio of brain mass to body mass?
Beaver a large semiaquatic broad-tailed rodent that is native to North America and northern Eurasia. It is noted for its habit of gnawing through tree trunks to fell the trees in order to feed on the bark and build dams. Beaver has the highest ratio of brain mass to body weight among rodents, which is reflected in the behaviour and the ability to act not only instinctively, but also logically.
What was included in the original Pepsi-Cola recipe?
Digestive enzyme. Pepsi Cola, first introduced in 1898, was named after pepsin (enzyme) and kola (nuts). In 1931, the company entered bankruptcy and changed hands. The new owners changed the recipe to resemble more Coca-Cola.
In which month is the Earth closest to the Sun?
In January. Earth's perihelion occurs around January 3, and the aphelion around July 4. The distance change is about 3.5%, which gives 6.9% increase in solar energy reaching the Earth at perihelion relative to aphelion. Since the southern hemisphere is tilted toward the perihelion, the southern hemisphere receives more energy from the Sun than does the northern over the course of a year.
Which mammal is venomous and dangerous to humans?
Platypus. The venom produced in the crural glands of the male platypus is not lethal to humans. However, it produces excruciating pain which does not respond even to morphine; sometimes the pain develops into a long-lasting hyperalgesia that can persist for months. Some biologists suggest that the venom may work directly on the brain's pain receptors. Other venomous mammals are small insectivores and vampire bats, which produce toxic saliva.