Mass Extinction
Extinction hits 'whole families'
Whole "chunks of life" are lost in extinction events, asrelated species vanish together, say scientists.
A study in the journal Science shows that extinctions tend to "cluster" on evolutionary lineages - wiping out species with a common ancestor.
The finding is based on an examination of past extinctions, but could help current conservation efforts.
Researchers say that this phenomenon can result in the loss of an entire branch of the "tree of life".
The message for modern conservation, say the authors, is that some groups are more vulnerable to extinction than others, and the focus should be on the lineages most at risk.
Animals on the brink of extinction
What are the 10 animals that are in the most danger of extinction?
1. Iberian lynx
The Iberian (Spanish) lynx lives in very small areas of central and southern Spain (Andalucia). It used to live throughout Spain and Portugal but its numbers have been drastically reduced to the point where it is now one of the most endangered wild cats in the world.
In the early 1950s the myxomatosis virus was illegally introduced by a French scientist to kill the wild rabbits on his estate which were destroying his vegetable patch. The virus spread rapidly, and killed about 90% of the wild rabbits in France. Spanish rabbits also died in huge numbers even going completely missing in some areas, so thousands of lynx starved to death. Habitat loss, hunting and trapping also have decimated the lynx. They are protected now, but they still get caught in fox traps. Another cause of death recently is getting hit by cars in Donana National Park.
Population size: approximately 100 - 150
Reproduction: Females breed about once a year, with a litter size of 1-3 cubs. In breeding captivity programs, a litter of 3 cubs was born in 2005, and another 3 cubs in March 2009.










