A Comparison of Nest Structure and Materials in Three Species of Penduline Tits ( <i>Remiz</i> spp.)

ABSTRACT Bird nest construction is shaped by both avian morphology and ecological context. In this study, we provide the first quantitative descriptions of nest structural parameters and material composition for the White‐crowned Penduline Tit ( Remiz coronatus ) and the Black‐headed Penduline Tit ( R. macronyx ). We also collected nest data for the Chinese Penduline Tit ( R. consobrinus ), allowing a descriptive comparison of nest architecture and nest materials across penduline tits. By quantifying nest structural parameters, nest mass, and material composition, we documented interspecific and interpopulation variation in several nest traits, including nest width, wall thickness, and corridor length. In the sampled nests, Chinese and White‐crowned Penduline Tits used mainly shredded plant stems, plant down, and wool, with mud additionally recorded in the White‐crowned Penduline Tit, whereas Black‐headed Penduline Tit nests consisted primarily of shredded reed leaves and reed down. Exploratory comparisons further suggested that populations with greater mean body length tended to have larger nest inner diameters, and that species with larger mean beak size tended to use wider nest fibers. Although these comparisons are descriptive only, our study provides new comparative natural history data on nest architecture and material use in penduline tits, laying a foundation for future work on the morphological and ecological drivers of nest construction in this group.