
Opossum
Behavioral Mimicry
Opossums are known for 'playing possum', a defense mechanism where they appear dead. 
Marsupial Distinction
Unlike rodents, opossums are marsupials, related to kangaroos and koalas, with a pouch for offspring. 
Not Always 'Possum'
In North America, 'opossum' refers to the Virginia opossum, not to be confused with 'possums' in Australia. 