Gower is home to some important and rare insects, such as at Rhossili Down where the southern damselfly and the very rare black bog ant can be found. Butterflies and moths are abundant thanks to the significant variety of plant life on the peninsula. Even some tropical species of moth have been recorded on Gower, such as the old world webworm, which was recorded at Nitten Field in 2011 – the first recording of the moth in Wales.
Mumbles Hill is perhaps the most important breeding site for butterflies on Gower and supports species such as the grayling and small blue. Other important sites include Oxwich, Llanrhidian, Welsh Moor and Whiteford Burrows. Llanrhidian supports the marsh fritillary butterfly, which is nationally rare but has a stronghold on the peninsula. Dragonflies and damselflies can be found near to ponds around Gower and at Llanmorlais on the Burry Estuary both red and blue dragonflies can be observed at a pond near to the cockling factory.
The relatively warm climate of Gower makes it a haven for many reptiles and amphibians. Common lizards and grass snakes can found in damp locations such as pond edges throughout the countryside, as well as in gardens. Adders often make their homes on heathland, woodland edges, commons and sand dunes, where can they can sometimes be seen basking in the sun during summer months. Nature Reserves, including Killay Marsh, are valuable habitats for amphibians such as the common newt, palmate newt, frog and toad.