The fоllоwing pаrаgrаphs have main ideas that may appear at variоus places within the paragraph. Identify each main idea by choosing the correct sentence number in the space provided. 1 Most non-human mammals demonstrate only a passing interest in the dead of their own species. 2 Lions will generally sniff or lick another dead lion before beginning to eat the body; chimpanzees will keep trying to interact with their dead friends and relatives until the bodies start to decompose. 3 Elephants, however, are unique among non-human mammals in that they appear to actually mourn their dead. 4 When presented with the dead body of another elephant, elephants will generally become agitated and upset, and caress the carcass with their trunks and feet. 5 In experiments in which elephants have been shown the skulls of a rhinoceros, a buffalo, and another elephant, they have demonstrated interest in only the elephant skull, gently touching and investigating it with their trunks and feet in much the same way they would a living elephant. 6 They also appear to be able to distinguish even very small pieces of ivory (elephant tusk) from other substances, such as wood and rocks; when presented with all three substances, elephants are overwhelmingly drawn to, and become agitated over, the ivory. 7 Animal scientists interpret these patterns of behavior as evidence that elephants are in mourning.