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.
Instantly recognised around the world thanks to their trunks and tusks, elephants are the world's largest land animals. African elephant males are the biggest of the bunch, weighing in at up to 6 tonnes, while smaller Asian elephants can still tip the scales at 5 tonnes. Female elephants are social animals, living in herds with their relatives. Males usually live alone but sometimes form small groups with other males.