sex for material things in animal world

 

http://www.wprost.pl/ar/159638/Kamyki-za-seks/?I=1373

Pebbles for sex
Number: 18/2009 (1373)
Chimpanzee living in Tai National Park forest in Ivory Coast, and more likely to have sex when they are giving to the meat. Pay for sex or insects and birds.
Anthropologist Craig Stanford 15 years ago had the idea that males pay considerations of female flesh. Verification of this hypothesis, however, was difficult, because the observations were carried out too long. Only studies lasting 22 months, Dr. Christophe Boesch and Cristina Gomes, of the Max Planck Institute for Evolutionary Anthropology have confirmed that males sharing the meat with females, afford them the favor. Chimpanzees share the principle that meat now, sex later. Not only donated
by females in estrus, but also those in the mating period will come in a few months. Males feeding meat bride copulate more frequently and have more offspring than those not involved in hunting. Discovery Boesch and Gomes also confirms the hypothesis that in primitive human societies (and not only) separating meat hunters have more sexual partners than others.
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The toll love animals a lot of knowledge among ornithologists. Birds feed on tasty helmets at the time of his better half love approximation - so behave, for example, gulls and ospreys New Zealand. Purple hummingbird antylak weapons against other kolibrami nectariferous access to flowers. Females allowed to them in exchange for copulation. Scientists believe that during the approximation of feeding or shortly after it is an investment in maternal health and fitness of offspring. Some species
are paying extra for extramarital sex. That does include living in Poland Srokosz shrike, which betray the notoriously male partner. Females do not remain the debt and at every opportunity to sell charms for gifts. Sex marriage in this respect is less attractive. Permanent bestows male partner usually just a worm, a lover brings hard to come by field rodents. Investment in the betrayal is four times greater than in the relationship in the privacy of legitimate outlet.

His considerations also sell females Adele penguins. The currency is building materials. In the absence of penguin nest of twigs are made up of pebbles. But in the Antarctic wilderness, even the stones are scarce. Males compete with each other in their quest and at the beginning of the breeding season, the neighborhood penguin colony is stripped of useful material. Thefts are common, and thieves caught red-handed are severely podziobani or kicked by the owner of the pile of stones. The higher
the seat, the better, because the colony was often flooded with water from melting snow. Only in the exaltation of the eggs have a chance to survive.

For additional stone is worth even betray. Females nest solitary march to the male. They encourage him to mate, and when it's over, take a pebble and go home. Visits often repeat - record-holder among females watched "bought" 62 stones. Not once owner of a valuable building material uszczuplaniu not protested against his property. The benefits are mutual. The male loses the pebbles, but it has a chance to become the father of another chick. Female and not only provides the safety of
their own eggs, but also makes contact with potential partners in the event that its current dead. Srokosz to natrudzi before something hunt and "earn" the leap to the side, but more to invest in a stable relationship. Treason is worth, in case some predator devoured clutch. Then there is a chance that a live chick raised by other parents. Srokosz female is no more chance of successful offspring, because the one who betrays, is uncommon opportunities.

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