There are many traits that become available only when some other trait gets to a high enough value. For instance gossip requires speech or some other method of

There are many traits that become available only when some other trait gets to a high enough value. For instance gossip requires speech or some other method of communication so only very few species get a chance to it (maybe dolphins? but not likely). There are traits that are definitely unique, like building rockets, but they are usually complex things.