Many tropical plant fossils have been found in Antarctica, which is definitely not a tropical place. There is a widely accepted theory that explains all of this: plate tectonics. Plate tectonics is the theory that the earth's crust is made up of tectonic plates. These plates "float" on the mantle, which moves due to convection currents. The plates each contain a different amount of ocean and land. When the plates move, it drastically changes the landscape. Many years ago, the plate that contains Antarctica was in a very different place.
Pangaea was the second known supercontinent on the face of the Earth. During the time of Pangaea, all of the land was a central mass surrounded by a global ocean. This mass was near the equator and had many tropical regions. When the movement of the plates broke up Pangaea, the bits of land took their fossils with them. Some of the fossils were tropical ones, and some of the plates went to very nontropical regions. This led to scientists theorizing that some landmasses were once in different places.
Other pieces of evidence helped with that theory, too. The fossils of numerous non-aquatic dinosaurs were found around the coasts South America and Africa. This also suggests that the continents were once joined. There are also broken up rock deposits and glacier paths that can be connected to re-piece the continents.
The blue duiker is a very important animal in Africa. It is used as food for many people and is also used in making traditional karosses. There is even a myth that ends with Tortoise turning Duiker's horns into a musical instrument. Because the blue duiker is so important, many people have hunted it, to a point where the population was in danger. Fortunately, the population is now strong, except in areas with a large amount of human activity. However, there is still concern about the blue duiker, and so it is on Article II of CITES, which means that any international import or export of blue duikers should be extensively monitored, but is classified as Least Concern (LC) on the Red List.
Because blue duikers are favored in many parts of Africa, husbandry, or breeding of the animals, has been attempted. It has not continued very far, but blue duikers of the fourth generation of human raising are nearly as domestic as goats, if nurtured by humans. Blue duikers are in many safari grounds, but otherwise are not much of a show/circus type of animal. There are some in captivity, however, they sometimes develop rumen hypomotility syndrome, or RHS. This is where lack of mobility causes a fatal build-up of the rumen. Blue duikers are very interesting and important animals, and are currently housed at the Fresno Chaffee Zoo.