Just in case you didn't know who Brian May is...
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Hedgehog Care Sitee.
'Get the poisons off the shelves' .. Dr Brian May
One single pellet may not kill a large animal such as a hedgehog but can build up in their stomach and cause permanent damage to internal organs over time. They do have a natural resistance to poisons from some snakes such as the Adder, but no resistance to Metaldehyde.