Great crested newts are legally protected but declining across the UK. Their welfare is tied to pond quality and the connectivity of the landscape around them.
Great crested newt welfare encompasses both aquatic breeding welfare and terrestrial habitat welfare across most of the year. Newts dispersing overland to find ponds or hibernation sites face road mortality, predation, and drought. In degraded ponds, larvae suffer from low oxygen levels, algal toxins, and fish predation. The DLL scheme attempts to offset development impacts but has been criticised for placing new ponds too far from declining populations to benefit individual animals. Individual welfare matters as well as population metrics.