Every year from April to November, some people in Norway always observe that the local forest is often killed by trees, in the 80s of the last century, two ecologists came here to check the beaver was smashed to death, they found that on the body of one of the beavers, lying on a 40 cm diameter European poplar, the aspen near the root has obvious animal bite marks, in the process of falling to the ground, hit the unfortunate beaver.
The two sorted out a number of beavers that people found to be killed, found that the beaver was hit by trees in a variety of ways, and even some of the beavers were still alive when they were found, but its tail was hit by trees, so that it could not get out.
Some people think that the beaver being smashed to death by the tree is the murder of other beavers, but ecologist Wilson believes that the reason why these beavers were smashed to death was their own.
< h1 class="pgc-h-arrow-right" > beaver</h1>
As the name suggests, the beaver lives by the river and is a small plant-eating animal. Beavers have many natural enemies in the forest, and almost any predator will threaten their existence, and when beavers find natural enemies, they will quickly burrow into the water. Beavers secrete a waterproof grease that they usually apply to their bodies in order to be waterproof. They are also able to hold their breath in the water for 12 minutes, which is generally enough for them to escape.
However, they can not always hide from predators, in order to create a safe and comfortable environment, they have to place their nests on the river, and the entrance to the nest is placed in the water.
The lowest layer of the beaver nest is a foundation made up of various stones, after which they are mated with wood, and the innermost layer of the nest is made up of a variety of soft hay and small branches.
The top of the beaver's nest is coated with mud, which is not only good against cold, but also blocks predator attacks and protects the safety of family members.
However, in the wild, the local river flow is not controlled by beavers, and once the local area faces drought, their nest entrances may be exposed to land, making them vulnerable to predators. In addition, narrower rivers can also make their nests easily exposed to the predator's field of vision.
In order to expand the water area and increase the depth of the river, the beaver will also use wood to build a long embankment.
Most beaver are only a few tens of meters long, but in alberta, Canada, the beaver family built an 850-meter-long embankment, which is also the longest beaver in the world and can be seen even in space.
< h1 class = "pgc-h-arrow-right" > beaver dyke</h1>
Beavers are monogamous animals that live together for life once they choose a mate. When adult beavers find an object, they will work with their partners to build an embankment, the main material of the embankment is a variety of wood, in order to obtain wood, they will use their teeth to bite off the wood.
Their teeth are rich in iron, which gives them a strong hardness, and even if they eat wood, they will not hurt their teeth.
Although beavers are animals, they build very elaborate embankments, they will first lay large trees to the bottom of the embankment, and the side with more branches will face the downstream of the river, which can ensure that the river is difficult to wash the embankment.
After that, the beaver will use small branches, sediment and aquatic weeds to block the gaps in the embankment to intercept the water source. When the water source is intercepted, the flow rate of the river will slow down, so the local water area will expand and the depth of the water flow will deepen, so that the local area will become a wetland environment.
It can be said that the more local beavers there are, the more local dams there are, the slower the local river flow, and gradually form a large wetland environment.
The wetland environment can provide a rich feeding ground for waterbirds, according to the study, the wetland created by the beaver is an important habitat for some water birds and mammals, so they are key species in the local ecological chain, their prosperity is conducive to the prosperity of the local ecosystem, and the reduction of their number will also lead to the deterioration of the local ecological environment.
<h1 class="pgc-h-arrow-right" why did the beaver hit by a tree >? </h1>
Since the beaver's food is a variety of trees, the nest is built from trees, and the main material of the dam also comes from trees, so beavers often go to the river from April to November to use their hard teeth to bite trees. Their skill at biting trees is so high that they can bite a tree with a diameter of 10 centimeters in just one hour.
However, they are so skilled in "logging skills", but they do not know how to predict the direction of trees, so that when trees fall, they can only escape aimlessly, as the saying goes, "often walk by the river where there are not wet shoes", in this way, some beavers are killed by the trees they bite off.