Nuts have varying amounts of fat and nutrition so here is some helpful information about the nuts you may be serving your bird, or help in deciding which nuts are best.
Pistachio Nuts - contain approximately 44% fat and 20% protein;
Cashew Nuts - contain approximately 46% fat and 15% protein;
Almonds - contain approximately 50% fat and 21% protein;
Hazelnuts or Filberts - contain approximately 61% fat and 15% protein;
Walnuts - contain approximately 65% fat and 15% protein;
Brazil Nuts - contain approximately 67% fat and 14% protein;
Pine Nuts - contain approximately 68% fat and 16% protein;
Pecans contain approximately 71% fat and 10% protein;
Macadamia Nuts - contain approximately 75% fat and 9% protein;
Peanuts - are not actually a nut at all, but rather a legume. Some people consider them as a "good fat". Peanuts do contain approximately 22% fat and 6% protein.