Sessile oak
The Sessile oak is so-called because its acorns are not held on stalks like those of the familiar English oak. It can be found in woodlands mainly in the north and west of the UK.
Search
Search
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: 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…
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.
Holm oak
The Holm oak is an introduced species that has been widely planted near the coast and in parkland. It is self-seeding in the south of the UK. Its young leaves are spiny like Holly leaves, and it…
English oak
The English oak is, perhaps, our most iconic tree: the one that almost every child and adult alike could draw the lobed leaf of, or describe the acorn fruits of. A widespread tree, it is prized…
Oak bush-cricket
The Oak bush-cricket is arboreal and can be found in mature trees in woods, hedges, parks and gardens in summer. Males don't have a 'song' as such, but drum on leaves with their…
Oak eggar
These moths can be seen flying on sunny days, but you're more likely to spot the fuzzy caterpillars crawling over paths.