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In page Horsea Island:

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All of the undeveloped area to the southwest of the lake, with the exception of the helipad, forms one of the few terrestrial parts of the Portsmouth Harbour Site of Special Scientific Interest (SSSI) on account of its calcicole flora and fauna[1] which have flourished on the imported chalk. Notable fauna includes the small heath butterfly Coenonympha pamphilus, designated BAP Priority Species by DEFRA on account of its increasing scarcity. Horsea is also the only known habitat in Hampshire of the micromoth Eulamprotes immaculatella [1].