A short video of one of the Kittiwake nests on anti-bird spikes
“The main risk is if they don’t build the nest deep enough, the eggs get pierced. If the nest is deep enough to cover the spines, it’s actually safer than a normal nest as it can’t be blown or washed off in a storm. Kitti chicks have evolved not to wander around, so are safe”.
Lophophanes