The 2008 IUCN Red List contains information on the conservation status of all of theworlds known mammal species Over 1,700 experts have contributed to these assessments.
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.
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 worlds mammal species are known to be globally threatened or extincted
“It has conﬁrmed an extinction crisis,with almost one in four [mammals] at 1,141 of the 5,487 mammals on Earth are known to berisk of disappearing forever” threatened with extinction
The habitat lost anddegradation are the main causes of exctinction.Land Change is mainly caused by Human activity and climate change
Global population of Blue Whale is uncertain. It is calculated over 10,000-25,000 speciescorresponding to a 3-11% of 1911 population
At over 33 metres (108 ft) in length and 180 metric tones (200 short tones) or more inweight, it is the largest animal ever known to have existed
They lives alone or withother individual. In locations where there is a high concentration of food 50blue whales have been seen
An adult blue whale can eat up to 40 million krill in a day. The whales always feed in areas with high concentration of krill.