Theophylact of Ohrid

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Now the reason that he omits mention of the other birds, and speaks only of the ravens, is, that the young of the ravens are by an especial providence fed by God. For the ravens produce indeed, but do not feed, but neglect their young, to whom in a marvellous manner from the air their food comes, brought as it were by the wind, which they receive having their mouths open, and so are nourished. Perhaps also such things were spoken by synecdoche, i. e. the whole signified by a part. Hence in Matthew our Lord refers to the birds of the air, (Matt. 6:26.) but here more particularly to the ravens, as being more greedy and ravenous than others.