️<unk>️<unk>️<unk>️  Most people have walked to the next street and even to the next town to enjoy some fast food from the takeaway rather than eat the less exciting options in the fridge at home.<unk> Most people have walked to the next street and even to the next town to enjoy some fast food from the takeaway rather than eat the less exciting options in the fridge at home. <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> Researchers at Lincoln Park Zoo in Chicago have found that chimpanzees are willing to walk longer distances to get their favorite food - grapes - even when they are offered another option closer to hand. <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Dr Lydia Hopper, a research scientist at the Lester Fisher Centre for the Study and Conservation of Apes at Lincoln Park Zoo, said she hoped to explore whether the convenience of the snack on offer may also impact how far chimpanzees are willing to travel. Dr Lydia Hopper, a research scientist at the Lester Fisher Centre for the Study and Conservation of Apes at Lincoln Park Zoo, said she hoped to explore whether the convenience of the snack on offer may also impact how far chimpanzees are willing to travel. Chimpanzees have special 'words' that they use for different types of food and can even learn the calls used by strangers from foreign groups. Primatologists have found that a group of adult chimpanzees from a safari park in Holland adapted the grunts they produced for foods like apples to match those of other chimpanzees they lived with in Edinburgh.<unk> ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk> ąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąą
Biologists at Lincoln Park Zoo in Chicago offered chimpanzees carrots or grapes.<unk> Biologists at Lincoln Park Zoo in Chicago offered chimpanzees carrots or grapes.<unk> The monkeys exchanged 'tokens' made of PVC tubes for the food they wanted.<unk> The monkeys exchanged 'tokens' made of PVC tubes for the food they wanted.<unk> The monkeys exchanged 'tokens' made of PVC tubes for the food they wanted. <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk>