Any evidence that can be peer-reviewed and reproduced is good enough.
Imagine the evidence required to show that Bigfoot exists. Pictures aren't enough to show that he is real: we need to be in constant contact with the creature, be able to meet up with it from time to time, or even capture it, file away a blood sample...anything more than the silly plaster casts of its foot that we currently have.
Imagine the evidence required to show that Bigfoot exists. Pictures aren't enough to show that he is real: we need to be in constant contact with the creature, be able to meet up with it from time to time, or even capture it, file away a blood sample...anything more than the silly plaster casts of its foot that we currently have.