EDNOTE. Nabokov watched and commented in interviews about the behavior of the Great Crested Grebes on Lake Geneva (AKA Lac Leman). In ADA the lovers also watch the dancing grebes.
 
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Armande would tell him to get up and stop playing the fool. The most ardent addresses he could think up - my princess, my sweetheart, my angel, my animal,  my exquisite beast - merely exasperated her. "Why," she inquired, "can't you talk to me in a natural human manner, as a gentleman talks to a lady, why must you put on such a clownish act, why can't you be serious, and plain, and believable?" But love, he said,  was anything but believable, real life was ridiculous, yokels laughed at love. He tried to kiss the hem of her skirt or bite the crease of her trouserleg, her instep, the toe of her furious foot - and as he groveled, his unmusical voice muttering maudlin, exotic, rare, common nothings and every-things, into his own ear, as it were, the simple expression  of  love  became a kind of degenerate avian performance executed by the male alone, with no female in sight - long neck straight, then curved,  beak  dipped,  neck straightened again. It all made him ashamed of himself but he could not stop and she could not understand, for at such times he never came up with the right word, the right waterweed.