News summary produced by Claude AI
Researchers at a natural history museum in Mashhad, Iran have identified an unconventional solution to a persistent problem: how to efficiently prepare animal specimens for study and display. The museum regularly receives donations of deceased animals, including road-killed specimens and injured birds, but storage constraints made traditional preservation methods increasingly impractical.
The team explored using superworms, the larvae of Zophobas morio beetles, to strip flesh from skeletal remains. These insects, native to South and Central America and commonly sold as animal feed in pet stores, can grow nearly as large as a human finger and possess powerful chewing mandibles. In experiments detailed in a paper published this month in PLOS One, researchers found that the larvae could effectively clean specimens ranging from small mice and fish to larger animals like wolves and wild cats.
The method offers several advantages over existing techniques. Chemical treatments used traditionally can harm the environment and degrade bone quality. Boiling is time-consuming and risks damaging delicate skeletal structures. Dermestid beetles, another insect option, work quickly but pose risks if they escape, as they can destroy museum collections by consuming feathers and preserved specimens. Superworms, by contrast, transform into adult beetles only when isolated, meaning they remain in their larval state when kept together and pose minimal escape risks.
The researchers found that ten to fifteen superworms per specimen produced optimal results, working at a reasonable pace without damaging fragile bones. The larvae can be reused for approximately six months, making the approach economically efficient. Alaei Kakhki, a bioinformatician involved in the study, emphasized that the worms work “super gently,” successfully cleaning even extremely delicate structures like fish ribs.
While the findings have generated interest in the museum community, some specialists have raised questions. Forensic entomologists and anatomists have suggested that the superworms’ powerful mandibles could potentially fracture small bones, and that because the insects prefer vegetarian diets, they may be inconsistent feeders on flesh. Despite these concerns, the research suggests superworms could provide accessible options for institutions with limited facilities and resources.