Old nipples are dark brown and rather wrinkly whereas young nipples are pink or very light brown, plump and wrinkle-free!
Boy guinea pigs don't have nipples.
No because it has a part of its brain that can tell the difference between a meal and its young.
That is a very good answer reader, well it actually depends of what kind of frog is is like if it is a bull frog you can tell but if it is a fire belly frog no one knows.
Can you tell the difference between Vyvanse and Concerta in a drug test
how can you tell the difference between a tortoise and a turtle by shell in picture
Vending machines have laser scanners that can tell the difference between the bills.
you can tell the difference between right and wrong from the little voice inside your head
please tell me the difference between thickness
no but you can tell the difference by taste
No. You can't tell the difference, for one reason: There IS no difference.