Please 
Puzzle Details
My first is in mammoth but not in elephant.
My second is in racoon but not in beaver.
My third is in dobbin but not in horse.
My fourth is in koala and in kangaroo.
My fifth is in tiger but not in lion.
My last is in pony but not in horse.
What am I?
Puzzle Copyright © Kevin Stone
Hint: My first letter is M.
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