1. The salangane birds build their nests high up on the cliffs.
(燕子鸟在悬崖上筑巢。)

2. Salangane nests are considered a delicacy in some Asian countries.
(燕窝在一些亚洲国家被认为是一种美味佳肴。)

3. The salangane chicks chirped loudly as their mother returned with food.
(当它们的母亲带着食物回来时，燕子雏鸟们发出了尖叫声。)

4. The sight of thousands of salanganes flying in formation was truly breathtaking.
(成千上万只燕子齐心协力飞行的壮观景象令人叹为观止。)

5. The villagers collected the fallen salangane nests to sell for profit.
(村民们收集了掉落的燕窝以获利出售。)

6. Conservation efforts have been put in place to protect the natural habitats of salangane birds.
(已经采取了保护措施，以保护燕子鸟的自然栖息地。)

Translate into Chinese:
1. 燕子鸟在悬崖上筑巢。

2. 燕窝在一些亚洲国家被认为是一种美味佳肴。

3. 当它们的母亲带着食物回来时，燕子雏鸟们发出了尖叫声。

4. 成千上万只燕子齐心协力飞行的壮观景象令人叹为观止。

5. 村民们收集了掉落的燕窝以获利出售。

6. 已经采取了保护措施，以保护燕子鸟的自然栖息地。