North Atlantic right whales (Eubalaena glacialis) are big, but they're not the biggest whales. That distinction goes to the blue whale (Balaenoptera musculus), the largest animal on Earth. The orca's size of up to 31 feet (9.4 meters) makes it the largest dolphin. The sperm whale, on the other hand, may not be the biggest whale, but it has the biggest brain to have ever existed on Earth. A comparison chart of whale sizes helps put it all in perspective!
Chikungunya fever is caused by a virus that is spread to people through the bite of infected mosquitoes. Like Dengue, it is transmitted by Aedes mosquitoes, especially Aedes aegypti (the yellow fever mosquito) and Aedes albopictus (the Asian tiger mosquito).
Figure 3. Distribution of the yellow fever mosquito, Aedes aegypti (Linnaeus), in the United States as of 2005. Illustration by Darsie RF, Ward RA. 2005. Identification and Geographical Distribution of the Mosquitoes of North America, North of Mexico.University of Florida Press, Gainesville, FL. 300 pp.einfestation by the yellow fever mosquito, Aedes aegypti (Linnaeus), in the Americas, as of 2002. Left image shows reduction of range resulting from the eradication programs beginning in the mid-1990s. Right image shows reinfestation resulting from the end of the eradication programs.