Hi, Rhonda. Please explain in more detail what you mean by "black nostrils on his beak." Are you referring to the bird's cere, i.e., the area above the beak where the nostrils are located or something on the bird's beak itself? Is this a parakeet as in an american parakeet also referred to as a budgie? Does this bird show any signs of being ill, such as sitting fluffed up on perch when not sleeping, wheezing, any liquid/moisture coming from nostrils or build up of anything around nostrils/beak, messy vent, staying on cage bottom, listlessness, not eating/drinking, droppings abnormal? All of these things will help me answer your question more accurately. Thanks! Chrys