I know of 2, but what else?

Question

k, so i know that no snowflakes, or fingerprints are the same, but what else? i heard that no spots on 2 cows are in the same place... i need to know more of them for a song i am trying to write

Answer 1

the positions of blood veins in the retina of the eye ,they scan retinas to identify individuals...........tom

Answer 2

Just about anything that occurs in nature.  And any part of the human body.  Of course, people usually only refer to things that have an identifiable print; for instance, no two forearms are identical, but it's hard to take an identifiable forearm print.  So some patterned things that are individually unique in nature could be:

tongue print

retina

iris

zebra stripes

cheetah spots

cow spots

Just look around.  Almost any patterned marking found in nature is unique to that particular instance of it.

Answer 3

Earprints, footprints, iris scans