Poisonous birds – Not venomous discovered so far
Poisonous birds – No venomous bird has been discovered so far. That is, one whose body would produce a poisonous substance. That would then be transmitted by pecking or wounding with a claw. There are several groups of poisonous birds, that is, poisoning us when we touch or eat them. Their organisms are also probably not producing toxins, but they are able to obtain them from poisonous insects or plants.
Most of them live in New Guinea. Where are several species of Pitohui. Also representatives of the families, store the strong neurotoxin (batrachotoxin) in the skin.
The Gambian Goose from the Anatidae family living in Africa. It accumulates in its tissues another poison, a kantaridine (it gets it from the eaten beetles). Plectropterus gambensis, however, are poisonous only after their consumption. So they gain little thanks to this weapon (except revenge from beyond the grave). On the other hand, other animals of this species benefit from this – a predator who once encountered goose meat will avoid it.
A similar phenomenon applies to the European Common Quail, whose meat is also poisonous, although only for part of the year. Probably quails get their toxin from being eaten plants, and poisoning them are known for a long time and referred to as a coturnism (from the Latin name of the quail Coturnix coturnix).
First birds – Victims of dinosaurs
First birds – Victims of dinosaurs – Paleontologist Jingmal O’Connor made in China discovery,
that the first birds were victims of representatives of the dinosaurs.
– “125 million years ago, dinosaur Microraptor Gui hunted and devoured entirely
representative of primitive birds from the group Enantiornithines.
The find confirms our belief that the dromerosaurs lived on the trees.“
Cave lions – Cause of their extinction was narrow nutrition specialization
Cave lions – Cause of their extinction was narrow nutrition specialization – With accurate analysis
of the bones of extinct Cave lions that the cause of their extinction was narrow nutrition specialization.
Research collagen have shown that these animals mainly liked to the reindeer that consume lichens.
With the change in climate 19 thousand. years ago, this type of lichens disappeared from Europe,
which began dying reindeer. Cave lions also not able to adapt to new conditions,
and consequently became extinct.
Cartilaginous fish – 455 species of sharks
Cartilaginous fish – 455 species of sharks – Found fossils show that sharks
living today belong to a group of cartilaginous fish. There are still very similar to their ancestors
who existed 150 million years ago. According to experts, currently in the waters of the seas
and oceans live 455 species of sharks. Joe Quattro professor of biology at
the University of South Carolina. In 2006 he discovered species, which is very similar to the
famous hammerhead sharks, but differs from it in terms of genetics.
Beluga whale – Delphinapterus leucas
Beluga whale – Delphinapterus leucas –Toothed whale from the family monodontidae. Lives in the cold waters of the Arctic and is one of the most endangered species. It is able to receive ultrasound at a frequency of 200 kHz (the human ear has the audible range from 20 Hz to 20 kHz).
Los Angeles underground discoveries
Los Angeles underground discoveries – In downtown Los Angeles during the construction
of the underground car park, have been dug up animal remains from the Ice Age.
Called to the place paleontologists have discovered bones of: cougar, wolves, horses,
European bisons and other mammals. Near the main findings lay the skeleton of the mammoth.
Mass genera extinctions – Phanerozoic biodiversity
Mass genera extinctions – Phanerozoic biodiversity – So far, on the Earth was 5 great periods of extinction. The oldest occurred in the Ordovician period – 440 million years ago. The next it: in the Devonian period – 365 million years ago, in the Permian 245 million years ago. Silurian 210 million years ago and the biggest in the Cretaceous – 65 million years ago. During the last dinosaurs became extinct all.
Charles Darwin – English naturalist
Charles Darwin – English naturalist – In 02.12.1809 was born English naturalist Charles Darwin.
The creator of the theory of evolution. He claimed that living organisms are subject to
natural selection and are derived from earlier forms.