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No they didn't, it was the Etruscans that invented this method of counting by symbols. No they didn't, it was the Etruscans that invented this method of counting by symbols.
It would be almost impossible to accurately count every animal in a population. Indirect counting methods are used to give indices of the relative numbers. This involves looking for things such as nests, burrrows, skat, tracks etc. to estimate the population.
Roman Numerals are essential for simple counting, a universal counting method as well.
They went to a decimal method of counting (base10) and invented zero
The Doppler method uses ultrasound; it involves a handheld listening device that transmits the sounds of the heart rate through a speaker or into an attached ear piece.