Look like a type of aphid.
Rick

Rick,
Thanks for your help, I found that these are oleander aphids, and they atack only oleander related plants and some article says adenium are related to oleander, this area is full (the city) I my self have 5 big ones, of oleander plants so the pest may be heavy, I will continue reading to find out the best way to get rid of them and will check my oleander plants too in the morning, thanks again