None Lex.  There are none and have probably been none.  If anything is apparent, its the number of filters that we have managed to pass through.  There is a frightening number of them and most are catastrophic.  How many sentient species have arisen on this planet in 3.5 billion years?  A handful and all related to us.  Is there life out there?  Probably.  Sentient?  Not probable given the unimaginable number of iterations it took to get us.