The water vole is among the 1,149 species listed in the UK Biodiversity Action Plan (BAP) for threatened species. Habitat destruction is one of the main reasons for its decline.
Weighing about 10 tonnes and measuring up to nine metres, the minke is smallest of the filter-feeding whales. They eat a wide range of fish and squid, krill and other plankton.
The bittern is one of the most threatened species in the UK because the secretive bird's dependence on disappearing reedbed habitats. Males are famous for their booming call.
The coral tooth fungus is a member of the group called "tooth fungi", which grows spore producing tooth-like spines. It is under threat because of the loss of suitable habitat.
Despite its name, the common toad has been listed as a BAP species. Its dark warts secrete powerful toxins when harassed, and potential predators soon learn to avoid it.
Alchemists in the Middle Ages required the purest dew for their experiments, which was gathered from the leaves of the lady's mantle. Herbalists also used the dew to treat wounds.
Although caterpillars of the grey dagger moth feed on a wide range of plants, wildlife experts have recorded a marked decline in the species within the UK.