When the water hits the right level, the baby birds are kept safe from predators by a corrosive ditch.
当水到达合适的水位时，幼鸟就会被一条腐蚀性的沟渠保护，免受捕食者的伤害。
This affects their nervous systems and ability to produce baby birds, and can lead to kidney failures and death.
这会影响它们的神经系统和繁殖幼鸟的能力，并可能导致肾衰竭和死亡。
In fact, most birds have a very poor sense of smell, so in most cases they are unable to even notice the smell of humans on baby birds.
事实上，大多数鸟类的嗅觉都很差，所以在大多数情况下，它们甚至不能注意到人类在幼鸟身上留下的气味。
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