“Bright colours are very noticeable to songbirds, they should see the cats further away, allowing them to escape earlier,” Ms Hall said.
“Because it’s based on colour and vision, cats won’t be able to learn to make it stop working.
“Unlike what people say about bells. [They say] that cats can learn to make them less effective over time.”
http://abc.net.au/news/2015-03-20/scrunchies-prevent-wildlife-death-study-finds/6337222