Great Crested Newt

Fascinating facts about the Great Crested Newt

• A male northern crested newt can grow a crest up to 1.5 cm (0.59 in) high during the breeding season, turning its back into a jagged sail that rivals a tiny flagpole. This crest, together with a swollen blue-white cloaca, signals readiness to court and helps the male attract a female on the pond's clear ground. The dramatic display is crucial because females only pick up the spermatophore the male deposits, so without a striking crest many males never reproduce.
• A single female northern crested newt can lay around 200 eggs per season, each about 1.8-2 mm in diameter inside a 6 mm jelly capsule. She spends roughly five minutes depositing each egg, folding them into aquatic plant leaves. Only about 4 % of larvae survive from hatching to metamorphosis.
• Northern crested newts spend about seven months each year on land, hiding in logs, stone walls or small mammal burrows, and only return to water when temperatures rise above 4-5 °C (39-41 °F). This temperature trigger usually occurs in March, prompting a nocturnal, deeper-water preference where they hide under vegetation. The tight link between land and water habitats means loss of either forest cover or fish-free ponds can quickly shrink local populations.
• Despite being the most widespread Triturus species, northern crested newts were likely confined to small refugial areas in the Carpathians during the Last Glacial Maximum, only expanding north-, east- and westwards when the climate warmed. Genetic studies show little variation across most of their range except in the Carpathians, confirming this historic bottleneck and highlighting the importance of those mountains as a source of genetic diversity.
• Northern crested newts can travel only about 100 m (110 yd) in a single night and rarely move more than one kilometre (0.62 mi) from their breeding pond. This limited dispersal makes them especially vulnerable to habitat fragmentation caused by urban sprawl. Connecting ponds with wide, uncultivated corridors is therefore a key conservation action, as it allows the modest nightly journeys that keep populations genetically linked.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

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