Sweet chestnut
The sweet chestnut is famous for its shiny brown fruits, or 'chestnuts', that are wrapped in a spiky, green casing and make a tasty winter treat. Look for this tree in woodlands in south…
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Horse chestnut
A tall, broad tree of woodlands, roadsides and parks, the introduced horse chestnut is familiar to many of us the 'conker' producing tree - its shiny, brown seeds appearing in their…
Invasive Species
Invasive species on Alderney
Notable Species
Notable species on Alderney
Key Habitats and Species
Key Habitats and Species
Key Species: Common Sole
The common sole is a flatfish of ecological and commercial importance and it is one of Alderney’s key species.
Key species: House Martin
A high flier that visits Alderney in spring and autumn. Discover where and when it can be spotted, and why it is a key species of the island.
Key species: Slow worm
Learn more about this unique species, the only reptile found on Alderney. Despite its misleading name, it’s actually a harmless legless lizard that is often mistaken for a snake because of its…
Sweet vernal-grass
Flowering in spring, the cylindrical, densely packed flower spikes of Sweet vernal-grass are easily spotted in a meadow. It also tastes of sweet vanilla and was once a favourite 'chewing…
Key species: Northern Gannet
Since the gannets made landfall last week (6 February 2026), we’d love to draw more attention to this charismatic bird of Alderney.
Key species: Egg wrack
This week, we highlight egg wrack, a large brown seaweed on Alderney’s rocky shores.
Key Species: Common Pipistrelle
Learn more about the smallest and most common bat of Alderney