Today I found a teeny tiny egg in the nestbox! It's smaller than my bantam's eggs, and has the same colors and appearance as the eggs my Welsummers produce (dark brown and spotted). These chickens are almost 3 or 4 years old (bought them as adults). Is this just an oops egg, or could there be something up with my chickens due to age? Here is the egg next to a normal egg I got this morning. Thanks!