Plumptre also says that the dungpile census should be carried out over a region similar in size to an elephants natural range The usual technique of monitoring only small,protected areas distorts numbers because elephants move in and out of these regions,he saysIf the elephant population increases within the protected area,you can not determine whether 1t is a real increase or whether it is due to elephants moving in because they are being poachedoutside.
Plumptre says that similar problems may also affect other animal census studies that rely on indirect evidence such as nests,tracks or burrows
1The wordthreatenedin the first sentence of the first paragraph could be best replaced by
A endangered
B frightened
C killed
D angered
2 Why do researchers estimate elephant numbers in an area by counting dung piles?
A Because elephants are difficult to catch
B Because it is not possible to count elephants from a plane.
C Because it is not possible to keep track of elephants.
D Because elephants are shy animals
3 Piles of dung cant be relied upon when it comes to estimating elephant numbers because
A they are different in size
B they scatter an over the region.
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