Bluebulb Projects' The Measure of Things presents:
3,900 is about half the number of Blue Whales in the World.
In other words, it's 0.46 times the count of Blue Whales in the World, and the count of Blue Whales in the World is 2.2 times that amount.
(Balaenoptera musculus) (2002 estimates)
The worldwide population of blue whales (as of 2002) is estimated to be between 5,000 and 12,000. An estimated 378,200 blue whales were killed during the height of whaling in the late nineteenth and early twentieth centures