How do scientists know how many animals of a species are left?



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    The methods of determining remaining members of a species depends on the type of animal, and pretty much involves simple observation. Audubon’s annual Christmas bird count is probably one of the most well-known methods. For larger animals like tigers and rhinoceroses, scientists and volunteers can literally observe and count individuals, as they become quite familiar with the different markings. Scientists are even counting giant kangaroo rats from space, using satellite remote sensing data!!

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