Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Indiana Jones:  This is a pretty good rabbit .
Jack Anders: Oh , it 's nothing compared to what we got in Australia . In Australia we 've got rabbita as big as kangaroos .
Indiana Jones: Really ?
Jack Anders: And kangaroos as big as horses .
Indiana Jones: As big as horses , is that right ?
Jack Anders: My old man saw _ one _ once , big as an elephant ...
Indiana Jones: An elephant ? You do n't say .
Jack Anders: Well , If you 'd ever been to Australia , you 'd know what I was talking about .
Indiana Jones: Well actually , I have been to Australia and the kangaroos they looked pretty normal sized to me .

kangaroos