The Museum's plant collection has over 6 million specimens. New ones are added all the time as scientists bring back plants from their travels around the world.
Collecting is only the beginning. Before a plant can be added to the collection it has to go through a number of stages, including being dried and mounted.
Join Andrea Hallaway, who works as a herbarium technician in the botany department, as she talks us through the process.
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The Museum's smallest members of staff are our flesh-eating beetles, Dermestes maculates, who strip carcasses to the bone.