Like most other animals including humans, this lion and lioness have XY and XX chromosome pairings in their genetic makeup. Picture: Shutterstock. According to popular theory, men live shorter lives than women because they take bigger risks, have more dangerous jobs, drink and smoke more, and are poor at seeking advice from doctors. But research by scientists at UNSW Sydney suggests the real reason may be less related to human behaviour and more to do with the type of sex chromosomes we share with most animal species. Zoe Xirocostas tested the 'unguarded X hypothesis' across a wide range of species in the animal kingdom.
Gay Lions? Not Quite
No, Those Aren't Male Lions Mating. One Is Likely a Female.
A photograph of two male lions seemingly in an amorous embrace has some humans clutching their pearls. After the release of the photograph, taken in August at Kenya's Masai Mara National Reserve, Ezekiel Mutua, the chief executive of the Kenya Film Classification Board, blamed humans or maybe demons for the male-on-male mounting. The actual story behind the photograph shows that Mutua got some things wrong. The mounting behavior isn't actually sexual. And the official jumped the gun on attributing human motivations to animal behavior, experts said. This isn't the first time two lions have been seen in a same-sex embrace. In March , another photographer snapped a male mounting and humping another male in Botswana.
do it. every day.
The out-dated idea that females are chaste and males are promiscuous needs to be thrown away. Once upon a time, animal courtship was thought to run something like a Barbara Cartland novel. The rakish males battle it out for a chaste female, who sits around choosing the prince charming to father her young. While her mate may sow his wild oats far and wide, she patiently tends her brood. Notwithstanding a few counterexamples, these roles were thought to be largely the same across the animal kingdom: males were thought to be promiscuous, dominant and aggressive and the females chaste and passive.
These pictures show how external hemorrhoids can appear different according to how much straining is going on. The first picture is of a relaxed anus, no straining. The second picture when it is slightly strained, and straight away you can see how the veins start bulging: The last photo shows what the external hemorrhoids look like when there is heavy strain going on. You can see from these pictures quite dramatically how straining can aggravate and cause hemroids.