Brittle Willow vs Cliff Mining Bee

Salix fragilis compared with Andrena thoracica

Key Differences

• Brittle Willow is Not Evaluated while Cliff Mining Bee is Extinct.

Taxonomic Classification

Rank	Brittle Willow	Cliff Mining Bee
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Arthropoda (Arthropods)
Class	Magnoliopsida (Dicots)	Insecta (Insects)
Order	Malpighiales (Malpighiales)	Hymenoptera (Ants, Bees & Wasps)
Family	Salicaceae	Andrenidae
Genus	Salix	Andrena
Species	Salix fragilis	Andrena thoracica

Conservation Status

Brittle Willow

NE — Not Evaluated

Cliff Mining Bee

EX — Extinct

Physical Characteristics

Attribute	Brittle Willow	Cliff Mining Bee
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Brittle Willow

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Widely distributed across Africa (South Africa), Europe (16 countries), North America (Canada, United States), Oceania and the Pacific (Australia, New Zealand), and South America (Argentina).

Cliff Mining Bee

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Denmark, Luxembourg, Norway, and Sweden.

Brittle Willow

The Brittle Willow (Salix fragilis) is a species in the genus Salix. Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Cliff Mining Bee

The Cliff Mining Bee, Andrena species in the family Andrenidae, is a solitary ground-nesting bee that excavates tunnels in cliff faces, earthen banks, and compacted sandy or loamy soils, where the loose or friable substrates exposed in cliff profiles provide ideal nesting conditions. Mining bees in the genus Andrena are among the most species-rich solitary bee genera in the world, with hundreds of species across the Holarctic region, many narrowly specialized in their choice of pollen host plants. Female cliff mining bees construct vertical or angled burrows in cliff faces, with lateral cells off the main shaft, each containing a pollen ball and a single egg. Males are typically smaller and emerge before females to establish territories near nesting sites. Many Andrena species are oligolectic, collecting pollen from only a small number of plant species, making their populations sensitive to the availability of specific flowering plants in the landscape surrounding nesting areas. Cliff and bank nesting habitats provide well-drained, sun-warmed substrates essential for brood development. The loss of natural cliff faces and earthen banks to development, vegetation succession, and quarrying reduces available nesting habitat for cliff mining bees.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden