Some oysters, such as Eastern, change their genders based on environmental, nutritional, and physiological stresses, and sometimes annually.
A genetic study in 2007 concluded that domestic cats are descended from Near Eastern wildcats, having diverged around 8,000 BCE in West Asia.
Once widespread throughout North America, Europe and the Far East, the grey wolf is, sadly, now only found in large numbers in specific parts of the USSR, North America and Eastern Europe.