Campaigners said they were going to stay on the island for six weeks to try and rescue as many as possible. So far on Monday, they said they had 15.
The birds in danger are some of the most important populations of waders in the country, and include the dunlin, redshank and oystercatcher.
The culling of the hedgehogs started last year, when 66 animals were killed. Scottish Natural Heritage (SNH) and RSPB Scotland say killing them is the only way to solve the problem.
But animal campaigners said they rescued and re-located 156 hedgehogs during the cull.