that means the elephants have to keep moving to findresh waterrelieving e essure on e local ecystem.ut smaller parks don't have that optn. so thers growing interest in the resus of rob cook's experiments with bees. he believes it's a groundbreaking methodith huge potential. >> we would love to see it applied to new species, particularly species which elephants are after such as the baobab species and then to see if it can be applied to our other projects such as the vulture nest project to see if we can protect trees with vulture nests in them using african honeybees and whether that relationship will or won't work. >> they should soon find out. the first hives are already in place. if it all works out, the bees could in future not only protect trees but also the birds and animals that depend on the trees for their survival. ♪ >> this week on global snack we check out something very tasty from brazil. >> the central market in sao paulo, the mercado municipal, offers a huge range of products, including typical brazilian fare. the market has existed since 1933 and the mortadella sandwi