The great crested newt is the UK's largest newt and one of Europe's most protected amphibians. Declining pond quality and loss of terrestrial habitat threaten populations across England.
Great crested newts face welfare impacts from both aquatic and terrestrial habitat degradation. In ponds with introduced fish, survival of larvae approaches zero — fish consume both eggs and larvae. Terrestrial habitat fragmentation forces newts to cross roads and bare arable fields — both mortality risks. The district-level licensing scheme introduced in England allows developers to translocate newts from development sites — but translocation is a welfare cost that requires high standards of receptor site quality to be justified. Newts at poor receptor sites show reduced survival and breeding success.