A groundbreaking conservation project has completed a custom-built sand martin nesting bank with 178 burrows at Testwood Lakes, Hampshire, as native populations face regional decline. The structure, designed to mimic natural cliffs with rain-resistant upward-facing entrances, was built by volunteers using grant funding and will allow precise monitoring of one of the county’s last three colonies.
A new nesting bank for sand martins is set to welcome its first residents later this month at Testwood Lakes Nature Reserve in Hampshire. This purpose-built structure features 178 pre-made burrow chambers, designed to replicate the steep sandy cliff faces these birds naturally prefer.
The design includes a critical detail: all burrow entrances face upward. This prevents rainwater from entering the nesting chambers, addressing the species’ known sensitivity to moisture BBC. This biomimetic approach ensures the artificial habitat meets the birds’ exact specifications for dry, secure nesting.
The project was made possible by a generous grant from the Hampshire Ornithological Society and a team of dedicated volunteers from the Hampshire & Isle of Wight Wildlife Trust. Without this community effort, the construction would not have been feasible, according to Ben Pickup, reserves officer for the Lower Test Valley Hampshire & IOW Wildlife Trust.
Sand martins, the smallest member of the swallow and swift family, have nested at Testwood Lakes for over two decades. However, their previous sandy bank habitat had deteriorated significantly in recent years, threatening the colony’s survival. This new bank replaces that failing structure.
The colony’s importance cannot be overstated; it is one of only three known sand martin colonies remaining in Hampshire. This makes the Testwood Lakes population a critical stronghold for the species in the county.
Conservationists now have unprecedented access behind the bank to monitor each of the 178 numbered burrows. Before the birds arrive, volunteers meticulously heap sand into each chamber and seal it with a small wooden door. The sand martins will then mould this sand into a perfect cupped shape to form their nests.
Typically, the species lays one or two clutches of four or five eggs per breeding season. While UK populations remain broadly stable, the Hampshire Ornithological Society reports a concerning decline in south-east England. In Hampshire, sand martins are now almost entirely confined to sand and gravel pits, with only 318 active holes recorded recently.
This new nesting bank represents a proactive intervention to reverse that local trend. It provides a durable, low-maintenance habitat that can support the colony for years to come, offering hope for the future of sand martins in the region.
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