Drowning has emerged as a mysterious cause of death amongst groups of young common starlings (Sturnus vulgaris), according to research by a team of scientists led by international conservation charity the Zoological Society of London (ZSL). Drowning as a cause of death amongst wild birds is comparatively rare and normally involves single rather than multiple animals. Starlings, however, have been observed to drown in groups of 10 or more, prompting scientists to investigate these unusual occurrences. The research team studied 12 separate incidents of starling drownings recorded between 1993 and 2013, finding that on 10 of these occasions, more than 10 birds drowned. All of these incidents, which usually involved juvenile birds just a few months old, occurred during the spring and early summer months. In all cases, scientists found no evidence of underlying disease as a cause of death. Dr. Becki Lawson, lead author and wildlife veterinarian at ZSL, commented: "Drowning appears to be a more common cause of death amongst younger birds, as they may be inexperienced in identifying water hazards. This combined with the fact that starlings are a highly social species could potentially explain why multiple birds drown together. Members of the public from around Great Britain have been instrumental in bringing this unexpected cause of starling mortality to our attention by reporting these incidents. With starling numbers declining in general across the UK, we need to learn more about how and where these phenomena happen, in order to better understand why," Dr. Lawson explained. The research was published online on November 25, 2015 in an open-access article in Scientific Reports.
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