euan ritchie and jen martin 's crowdfunding page they launched received a baffling pledge for over $ 2 billion .
within an hour , the momentous donation to a kangaroo preservation project launched by ecologists euan ritchie and jen martin had vanished , and they still have n't been able to track down the would-be benefactor .
` my initial reaction was shock and disbelief , ' euan ritchie told daily mail australia .