- 北境漫步
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Beavers are semi-aquatic rodents native to North America and Europe. They are the only living members of the family Castoridae
which contains a single genus
Castor. Geic research has shown the European and North American beaver populations to be distinct species and that hybridization is unlikely. 图片参考:upload.wikimedia/ *** /mons/thumb/2/2b/Biber_2_db/250px-Biber_2_db 图片参考:en. *** /skins-1.5/mon/images/magnify-clip Beaver in Ontario
Canada 图片参考:upload.wikimedia/ *** /mons/thumb/c/cc/Beaver_pho34/250px-Beaver_pho34 图片参考:upload.wikimedia/ *** /en/thumb/7/77/Beaver/200px-Beaver Beavers Fossil range: Late Miocene - Recent American Beaver Scientific classification Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Rodentia Family: Castoridae Genus: Castor Linnaeus
1758Beavers are best known for their natural trait of building dams in rivers and streams
and building their homes (aka lodges) in the eventual artificial pond. They are the third largest rodents
after the capybara and the mara. Beavers continue to grow throughout life. Adult specimens weighing over 25 kg (55 lb) are not unmon. Females are as large as or larger than males of the same age
which is unmon among mammals. The European Beaver (Castor fiber) was hunted almost to extinction in Europe
both for fur and for castoreum
a secretion of its scent gland believed to have medicinal properties. However
the beaver is now being re-introduced throughout Europe. Several thousand live on the Elbe
the Rhone and in parts of Scandinavia. In northeast Poland there is a thriving munity of Castor fiber. They have been reintroduced in Bavaria and The Netherlands and are tending to spread to new locations. The beaver finally became extinct in Great Britain in the sixteenth century: Giraldus Cambrensis reported in 1188 (Itinerarium ii.iii) that it was to be found only in the Teifi in Wales and in one river in Scotland
though his observations are clearly first hand. In October 2005
six European beavers were re-introduced to Britain in Lower Mill Estate in Gloucestershire
and there are pl for re-introductions in Scotland and Wales. The extinct North American Giant beaver (Castoroides ohioensis) was one of largest rodents that ever evolved. It disappeared
with other large mammals in the Holocene extinction event
which began about 13
000 years ago. The habitat of the beaver is the riparian zone inclusive of stream bed. The habit of the beaver for hundreds of thousands of years in the Northern Hemisphere has been to keep these watery systems healthy and in good repair
although to a human observer
seeing all of the downed trees
it might sometimes seem that the critters are doing just the opposite. Beaver work as a keystone species in an ecosystem by creating wetlands that are utilized by many other species. The ability of beavers to radically alter landscape is amazing. Next to hum
no other extant animal does more to shape its landscape.
Beaver meaning is1. 海狸
河狸[C] tTo put it simple
Beaver is an Early AdVanced EditoR
for Linux and other Unices (and even Windows). It is licensed under the GNU GPL and intended to be ligheight
but full of useful features for programming
from website editing to coding. It is based upon the GTK+ 2 toolkit
supports many languages through config files and offers functions such as automatic indentation
pletion and correction
as well as syntax highlighting. It even has its own mini macro language. Please see the menu on the left for more information. If you are interested in the development of Beaver
did a patch or want to report a bug
please subscribe to the main mailinglist [email protected] Update: Beaver is more than a little unmaintained. If you have the gumption and the desire to whip Beaver into shape
please email our mailing list and lets talk.
参考: nongnu/beaver/
Beavers are semi-aquatic rodents native to North America and Europe. They are the only living members of the family Castoridae
which contains a single genus
Castor. Geic research has shown the European and North American beaver populations to be distinct species and that hybridization is unlikely. Beavers are best known for their natural trait of building dams in rivers and streams
and building their homes (aka lodges) in the eventual artificial pond. They are the third largest rodents
after the capybara and the mara. Beavers continue to grow throughout life. Adult specimens weighing over 25 kg (55 lb) are not unmon. Females are as large as or larger than males of the same age
which is unmon among mammals.
参考: en. *** /wiki/Beaver