Usa "birdcall" in una frase

1. I knew this because just then, a real birdcall pierced the

---

2. Bruce heard a subtle birdcall he learned in his scouting days

---

3. Now, in early afternoon, I leaned back in the saddle and announced our arrival with the usual birdcall

---

4. Sometimes, as if in a dream, she heard roaring, trumpeting, twists of strange birdcall,

---