They were already in pairs and the males were in full song.
The Robins were in full song; one nest of that bird was found; the White-throated Sparrow and Savannah Finch were also in full song.
They are, as a consequence, very much mixed up on their seasons, and I have heard a swamp infull song in November.
One season, early in May, I discovered an English skylark in full song above a broad, low meadow in the midst of a landscape that possessed features attractive to a great variety of our birds.
Above a broad stretch of undulating meadow-land on my right the larks were in full song.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "full song" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.