I'd like to ask about a phenotype topic that I've been pondering for a while.
Individuals of each species all have unique facial structure/trait variations (shape of nose, position of chin, distance between eyes etc) from humans to birds and fish etc. We humans don't seem to be reaching mathematical limit of uniqueness easily (maybe till the end of the world) considering huge variation and all possible combinations that define our facial structure/traits.
However some animal populations are way more larger than humans and each year they reproduce in large amounts. Considering their huge populations, is it possible for some species to reach their mathematical limit of having unique facial structure/trait variations therefore start repeating the exact same faces? For example can individuals of some fish species (sardines, sea breams etc) be already sharing exact same facial structure/trait as a result of reaching all posible facial structure/trait variation limit?
I believe there must be a mathematical limit in the number of unique facial variations taking into account all possible genetic and environmental factors, no matter this number is astronomically large.
Thanks for your responses!
