little bird 除了有“小鸟”的意思外，还可以指：消息灵通的人。

【例句】
A little bird told me that they had already divorced secretly.
一位消息灵通的人告诉我他们早已秘密离婚了。

A little bird told me we have to work overtime tonight.
消息灵通的人告诉我，我们今晚必须加班。