Cuisine varies greatly around the world, but the basic ingredients that sustain humans are pretty similar. We eat a lot of corn, wheat, rice and other simple crops. Read on to find out which foods top the list of most important worldwide, listed by annual production and average yield in 2008.
Howler monkeys are widely considered to be the loudest land animal. According to Guinness Book of World Records, their vocalizations can be heard clearly for 3 mi (4.8 km). The function of howling is thought to relate to intergroup spacing and territory protection, as well as possibly to mate-guarding.
Bats (order Chiroptera) have the most acute hearing of any non-aquatic animal, due to their ultrasonic echolocation. Most species use frequencies in the 20-80 kHz range, although some can hear frequencies as high as 120-250 kHz, compared with almost 20 kHz for the human limit and 280 kHz for the common dolphin (Delphinus delphis).