Animal rights activists marched in St Ives as part of a protest against the work of Harlan Laboratories site at nearby Wyton where animals are bred for research.
The group marched through the town centre after a demonstration outside Harlan's premises organised by the National Anti-Vivisection Alliance (NAVA).
Dr Victoria Martindale, of Safer Medicines, who was one of the speakers at the rally in St Ives, said: 'It is an industry where torture and murder goes on in secret.
'Without Harlan the vivisection industry would not survive.'
Dr Harlan said tests on animals produced flawed results and that more reliable tests which did not involve animals were available.
She said: 'This is an area where science has not caught up and still relies on models dating back to the Victorian era.'