25 August 2008
Elephants can discern numerical values by observation.
"It really is tough to figure out why [elephants] would need to count," says Mya Thompson, an ecologist at Cornell University who studies elephants…. Asian elephants live in close-knit groups of six to eight, and they may count one another to make sure the herd sticks to together. "You really don't want to lose your group members," she says.
"Elephants Master Basic Mathematics" by Ewen Callaway – New Scientist – 8/20/08 http://www.newscientist.com/article.ns?id=dn14569&print=true