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Probably every story there when cat and dog are best friends, but it does, as a rule, if these two pets live in the same apartment, and just got used to each other. But the true dislike for each other appears on the street, and a rare dog calmly pass by the yard cat. But why dogs and cats are not friends?

The reasons for hostility

The first reason - the territorial instinct. They simply protect their territory, but the dog is large in size, and they are pack animals, in contrast to the single cats, on the last and has to be rescued


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The second reason - cats are not very afraid of dogs, they are likely to try to avoid greater contact with it. There are cases when the proud cat that just too lazy to run, it is better to take the fight, and most dogs eventually get scarred face. Although it depends on both animal species.

Reason Three - old Chinese legend that once a dog rescued a drowning girl, daughter of the governor. Happy father in gratitude fastened to the tail of the dog decree stating that anyone should feed a stray dog. Arrange a holiday, a dog gave deposited decree cats, but the night had stolen mouse paper and tore it. Dogs do not believe in it, and now the eternal enmity between cats and dogs, and cats and mice.

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Five years of observation of life the Brazilian rainforest have helped scientists discover the seven previously unknown species of frogs, each of which is characterized by an extremely tiny size - the length of their bodies and not more than a centimeter, according to a paper published in the journal PeerJ.

"These seven species - only the beginning, given that we have found some new members of this genus during the preparation of the article for publication, and now we have begun the process of formal description," - said Luis Ribeiro (Luiz Ribeiro) of the Institute for the Study Environment in Curitiba (Brazil).

Ribeiro and his colleagues spent five years in the mountainous forests of Brazil on the Atlantic coast of South America, watching the frogs of the genus sedlonosnymi Brachycephalus, all members of which are a kind of miniature champions among amphibians.

They all have a bright and highly visible coloration that warns predators of man and that is very dangerous armed toad venom - tetradoksinom, specific neurotoxin, which blocks the sodium "pumps" in the nerve cells and causes paralysis and death.

As they note, sedlonosnye toads are big homebody. Each species occupies a small habitat in the mountains, lowlands, or in other parts of the countryside, to living in which they are suited, because of what they is extremely difficult to find and catalog.

Partly for this reason, the scientists were able to find a total of seven new species of frogs in the five years of intensive search, although they suspect that the "cloud" forests of Brazil found a lot more of these unusual species of amphibians.

Interestingly, some of the findings of Ribeiro and his colleagues was named after the prominent Brazilian environmentalists, whose efforts are now focused on the preservation of the rainforest, where they live sedlonosnye toads and other species of tropical animals now threatened with extinction.

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