We just got 2 Pekin ducklings from TSC and they are about a week old. We know they are Pekin but we don't know what genders they are. Here are some questions: 1. At what age do drakes get their "drake feather" 2. When do they start to make the noises to tell if they are a boy or girl? (What age?) 3. Does bill color contribute to gender at all? Thank you!