Dos%2520pichones%2520de%2520golondrina%2520quieren%2520saber%2520qui%25C3%25A9nes%2520son%2520esos%2520p%25C3%25A1jaros%2520raros,%2520y%2520por%2520qu%25C3%25A9%2520hacen%2520esos%2520ruidos%2520,%2520y%2520por%2520qu%25C3%25A9%2520vuelan%2520de%2520esa%2520manera...%2520es%2520que%2520los%2520pichoncitos%2520quieren%2520averiguar%2520qui%25C3%25A9nes%2520ser%25C3%25A1n%2520sis%2520compa%25C3%25B1eros%2520de%2520vuelo.