The document discusses endangered species and the blue whale. It provides statistics on endangered mammals from the 2008 IUCN Red List, including that 40% of evaluated species are endangered. Indonesia, Brazil, China and Mexico have the most mammal species, with over 500 each. Nearly a quarter of mammal species are threatened or extinct. The main causes are habitat loss and degradation due to human activity and climate change. Details are given on the size and habits of the blue whale, the largest animal. Threats to blue whales include hunting, orca attacks, melting glaciers, and changing ocean temperatures affecting their food supply.
4. The 2008 IUCN Red List contains information on the conservation status of all of the
world's known mammal species Over 1,700 experts have contributed to these assessments.
5. The IUCN has calculated the percentage of endangered species as 40 % of all organisms
based on the sample of species that have been evaluated through 2006.
6. The most diverse country for
mammals is Indonesia (670),
followed closely by Brazil (648).
China (551) and Mexico (523) are
the only other two other
countries with more than 500
species
Nearly one-quarter (22 %) of the
world's mammal species are
known to be globally threatened
or extincted
7. โIt has con๏ฌrmed an extinction crisis,
with almost one in four [mammals] at 1,141 of the 5,487 mammals on Earth are known to be
risk of disappearing foreverโ threatened with extinction
8. The habitat lost and
degradation are the main causes
of exctinction.
Land Change is mainly caused by
Human activity and climate
change
9. Global population of Blue
Whale is uncertain.
It is calculated over
10,000-25,000 species
corresponding to a 3-11%
of 1911 population
10. At over 33ย metres (108 ft) in
length and 180 metric tones
(200ย short tones) or more in
weight, it is the largest animal
ever known to have existed
11. They lives alone or with
other individual. In locations
where there is a high
concentration of food 50
blue whales have been seen
