Atypical molt sequences among primaries of Harris's Hawks (Parabuteo unicinctus harrisi) in south Texas/Secuencia atipica de muda de primarias del halcon Parabuteo unicinctus harrisi en el sur de Texas

I show cases of atypical molt in the primaries of Harris's Hawk (Punihuteo unicinctus harrisi). Molt of the primaries in accipitrid raptors typically proceeds sequentially one feather at a time from the inner primary, PI. to the outer primary, P10. In larger species, not all primaries are replaced annually, resulting in Staffelmauser ('stepwise' or 'relay' molt). From 2002 to 2022.1 captured 545 Harris's Hawks in south Texas, either undergoing or having finished third prebasic molt or older, undergoing the second prebasic molt, or in Basic II plumage. 1 report herein on 6 instances in which 1 or more primaries were skipped or replaced out of order during the annual molt in Harris's Hawk: 5 undergoing the second prebasic molt and 1 undergoing third prebasic molt. I found 1 published case of skipped primaries in Griffon Vultures (Gyps fulvus) and another in a White Stork (Ciconia ciconia). One possible cause of this could be damaged primary follicles. Received II March 2022. Accepted 17 September 2022. Key words: out-of-order primary molt, skipped primary molt. Muestro casos de muda atipica en las primarias del halcon Parabuteo unicinctus harrisi. La muda de las primarias en rapaces accipitridos procede tipicamentc de manera secuencia!. una pluma a la vez a partir de la primaria interna. PI, hacia la primaria externa. PIO. En las especies mas grandes. no todas las primarias son rccmplazadas anualmente. lo que resulta en una Staffelmauser (muda 'por etapas' o 'relevos'). Del 2002 al 2022, capture 545 halcones de Harris en el sur de Texas, ya sea que estaban durante o al final de su tercera muda prcbasica o de mas edad, que esten realizando la segunda muda prcbasica o que esten en el plumaje basico II. Aqui reporto 6 instancias en las que 1 o mas primarias fueron sahadas o reemplazadas en desorden durante la muda anual en halcones de Harris: 5 durante la segunda muda prehasica y I durante la tercera muda prebasica. Encontre 1 repone publicado de primarias saltadas en buitrcs Gyps tubus y otro en cigiienas Ciconia ciconia. Una posiblc causa de esto serian foliculos primarios danados. Palabras clave: muda primaria desordenada. salto de muda primaria.
Molt of the primaries in accipitrid raptors begins with the innermost feather (PI; primary molt center) every annual molt cycle. Molt proceeds sequentially in a wave with the next primary, [...]