Great Crested Newt

Because the species has strict legal protection in the United Kingdom and across much of the European Union, it is a criminal offence to kill, injure, capture, or deliberately disturb a great crested newt, or to damage or destroy a breeding site or resting place, without a special licence, regardless of who owns the land. If a survey finds great crested newts, or suitable habitat likely to hold them, on or near a proposed development site, the developer must typically commission further surveys, obtain a licence, and provide mitigation such as newt fencing, alternative habitat, or a redesigned layout before work can proceed, a process that can add significant time and cost, which is why the species has become well known in British planning circles.

The tall, jagged crest that develops along a breeding male's back, together with the smoother crest along the tail, is a seasonal ornament used almost entirely in courtship rather than for any defensive or swimming function. During an elaborate underwater display, the male positions himself in front of a female, arches his body, and fans his tail to waft scent toward her while showing off the crest, and females appear to use the size and condition of the crest, along with the quality of the display, as one basis for choosing a mate. The crest is reabsorbed after the breeding season and regrows the following year.

Look for a large, dark, rough or warty-skinned newt with a vivid orange belly covered in irregular black blotches, a pattern that is unique to each individual and can be used to identify and track specific newts over time through photographs. Breeding males add a tall, jagged crest along the back with a distinct gap at the base of the tail before a separate tail crest resumes, while females lack the crest but often show a yellow-orange stripe along the length of the tail. Great crested newts are also noticeably larger than Britain's other native newts, the smooth and palmate newts, which helps separate them even without a clear view of the belly pattern.

Once breeding finishes, usually by early summer, adult newts leave the pond and spend the rest of the year on land, often within a few hundred metres of the breeding site, sheltering by day and in cold weather under logs, stones, and dense vegetation, in compost heaps, and in small mammal burrows, and emerging at night to hunt invertebrates. This terrestrial phase makes rough grassland, hedgerows, scrub, and woodland edge around a pond just as important to the species' survival as the pond itself, which is why conservation and development mitigation for the species considers a wider area of land, not just the water.