The following species groups have provided information to SEDN. Data presented on the maps is summarised to 2x2 km squares (tetrads) and the only other data included is - date last seen in that tetrad.
Other sources of data
Data on some species groups not currently held by SEDN can be obtained through the National Biodiversity Network (NBN). Much of the data held by SEDN is also found on the NBN at full resolution rather than just the tetrad (2x2 square km) resolution.