Up to 900 artificial nest "cups" for threatened house martins are set to be installed in Hampshire as part of a conservation project.

The birds migrate from Africa each spring and are on the UK's Red List of endangered bird species. They are thought to have suffered from a lack of wet mud to build nests during the extreme heat in the summer.

Following a pilot project, The Hampshire House Martins Project is offering free cups which save the birds time and energy compared to building their own mud nests.