The Birds of Australia London Witherby & Co. 1910-1927. Australia Bibliography Birds Birds of Australia Pictorial Works Bird Australia Mathews, Gregory Mathews Ornithology, This illustration features three birds perched on intertwined branches, showcasing their distinctive plumage and features. The uppermost bird displays vibrant yellow underparts and a dark cap, known for its striking appearance. The middle bird exhibits a more subdued coloration with olive tones and a hint of yellow, while the lower bird is characterized by a soft grayish hue, blending subtly with its surroundings. All three species belong to the Pachycephala genus, commonly referred to as whistlers. The background is lightly textured, emphasizing the natural setting of the birds.