This has fallen to about 117 and about half of those breed in and around Langstone Harbour.

BBC: Langstone Harbour little tern nesting site project starts

About 117 pairs now nest in the area and more than half of those breed at the beach in Langstone Harbour compared to about 350 pairs 30 years ago.

BBC: Little tern

For the second half, local success can breed failure at scale.

FORBES: Water for People CEO: We Need to Focus on Outcomes, Not Inputs