The pig¡¡¡ :P

Pigs are considered greedy and dirty, for many humans a source of mockery, something to eat or a nickname to insult others. Far from so much prejudice and discrimination are some nonhuman animals friendly, noble and intelligent, very clean contrary to what we think and who actually like to spend the day eating, playing and sunbathing. Pigs are very curious, are usually always looking for new stimuli, and when offered two objects, one familiar and a new one, prefer the new.
Pigs are more intelligent than a child of 3 years.

Animals in danger: The Elephant

While climate change and deforestation are to blame for the species on this list, the main enemy of elephant ivory is still his. This is a very appreciated by people who have no regard for elephants, only make good money selling the ivory black market, so that the extinction of the species may be closer than you think.

Animals in danger, Bengal Tiger

The second animal is most endangered Bengal tiger, which inhabits mangroves between Bangladesh and India. The Bengal Tiger or Indian is, after the Siberian tiger, the second largest tiger species on the planet.

Animals in danger, polar bear.

First place is occupied by the polar bear as a species could disappear within 50 years if, as expected, continue to shrink the Arctic ice sheets. The layer of Arctic sea ice melts at an average of 9% every ten years.
 Polar bears belong to a species that depends entirely on the existence of the frozen sea. The bears use ice as a floating platform from which to hunt seals. At present there are only 20,000 to 25,000.

Photos of the zoo of Madrid