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Most studies of kin recognition in birds have examined parent-offspring recognition and few have focused on individual sibling recognition. A new study of common tern chicks investigates the development of sibling recognition. The study shows that sibling determination among common tern chicks develops as early as 4-days-old.

Scan sampling was used to monitor preening behavior in the common tern, Sterna hirundo, to investigate socially facilitated preening in this species. Results reveal a temporal and spatial synchrony in preening behavior. The rate of preening behavior appear to be dependent on tern density in nesting and loafing areas. Simultaneous preening also took place more frequently between breeding pairs. Maintenance behaviors such as social facilitation of preening are probably important aspects of group living.

Fluctuating asymmetry (FA), random deviation from perfect bilateral symmetry, is an indicator of developmental stability. Examining the ontogeny of FA can illustrate whether symmetry is actively maintained as the organism grows or breaks down as perturbations accumulate with age. Previous studies of changes in human FA with age have been cross-sectional studies and give conflicting results. We analyzed data from a longitudinal study of bodily FA in Jamaicans, using a composite index of seven paired traits. In addition, 288 children (ages 5-12) were first measured in 1996, and many were re-measured in 2002 and 2006 (maximum age = 22 years). Both within-individual longitudinal comparisons and between-individual comparisons across age groups demonstrate changes in FA with age. In males and females, FA increased until around age 13, but the pattern of change differed between the sexes. In males, FA increased rapidly approaching adolescence and then slightly declined into early adulthood. The increase in female FA was more gradual and then leveled off. The patterns observed likely reflect accumulation of developmental errors over time, rapid physical changes during puberty (especially in boys), and then regulation of symmetry when transitioning into adulthood. Although most changes in symmetry over time probably reflect random processes, the magnitude and direction of asymmetry in an individual at one point in time tended to be positively (though weakly) related to asymmetry in later years, pointing to underlying differences among individuals in developmental stability. [ABSTRACT FROM AUTHOR]

Analyzes the development of kin recognition in common tern chicks using choice experiments. Nestmate recognition; Behavioral development.