我看见一对灰头麦鸡的雌雄在水田里找吃儿食物。

我看见一对灰头麦鸡的雌雄在水田里找吃儿食物。
当 它们发觉 有 人或者 其他 生物太接近得太近它们的窝的时候，它们都就激烈[猛烈is much better]出击[攻击is much better]。不过找吃儿[食物]的时候，它们 很 温顺。

I saw a pair of Grey-headed lapwings searching their foods [food is uncountable] in the paddy rice field.
When they find [Detect, I think detect here is much better] a human being or something else is approaching their nest too close, they attack the intruder[invader] severely. But when they are searching their food, they are gentle.

I saw a pair of Grey-headed lapwings searching their food in the paddy rice field.
When they find a human or something approaching their nest too close, they attack the intruder severely. But when they search their food, they are gentle.

我看见灰头麦鸡的雌雄在水田里找吃儿。

我看见灰头麦鸡的雌雄在水田里找吃儿。
它们发觉人或者生物接近得太近它们的窝的时候，它们都就激烈出击。不过找吃儿的时候，它们温顺。

I saw a pair of Grey-headed lapwings searching their foods in the paddy rice field.
When they find a human or something approaching their nest too close, they attack the intruder severely. But when they search their foods, they are gentle.                         
我看见一对灰头麦鸡在麦田里找吃的。他们发觉人或其他东西太靠近他们的窝时，它们会猛烈出击。不过他们再找食很温顺