Improvements in or relating to a colonial-seabird nesting and feeding structure

A colonial-seabird nesting structure 10 for increasing breeding productivity and providing a safe access space for a user. The structure 10 has a user-access element 12 and a closure element 14. A wall 16 of the user-access element 12 defines a user-access area 18. The closure element 14 openably closes an access opening 22 in the wall 16. The closure element 14 has a first surface which in use faces outwardly to the environment, a user-facing second surface which faces inwardly towards the user-access area, and a colonial seabird-support element. The bird-support element extends from the first surface and is adapted to support at least one bird or nesting structure. The closure element 14 also includes a capture-device aperture for insertion of a capture device to temporarily capture a bird supported by the colonial seabird-support element, along with a viewing element. To improve user safety, the closure element 14 is movable relative to the access opening 22 to enable the bird-support element to be selectively movable into the user-access area 18, for example, for maintenance and cleaning. A bird-population compensation system is also disclosed.