What is culture?

Sperm whales are matrilineal, which means that females stay with their mothers, forming groups called social units. These social units are comprised of one or two families and are stable over their entire lives. They travel together, socialize together, forage together and learn from each other. Beyond social units, sperm whale societies are also organized at a higher tier called vocal clans. Vocal clans include thousands of individuals and can be recognized acoustically.

The remaining elephants in Sierra Leone were killed

The few remaining elephants in Sierra Leone were killed in October by poachers serving the thriving black market in ivory, which fetches up to $1,500 (£980) a kilo in the Far East. In the Zakouma National Park in Chad, poaching has cut the population from 3,885 in 2006 to only 617 last year.

The number of elephants lost to poaching in Kenya has quadrupled in the past two years. Kenya is one of seven African nations proposing a 20-year moratorium on sales of stockpiled ivory. The Times