Cliff Mining Bee vs Great Skua

Andrena thoracica compared with Stercorarius skua

Key Differences

• Cliff Mining Bee is Extinct while Great Skua is Least Concern.

Taxonomic Classification

Rank	Cliff Mining Bee	Great Skua
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Arthropoda (Arthropods)	Chordata (Chordates)
Class	Insecta (Insects)	Aves (Birds)
Order	Hymenoptera (Ants, Bees & Wasps)	Charadriiformes (Charadriiformes)
Family	Andrenidae	Stercorariidae
Genus	Andrena	Stercorarius
Species	Andrena thoracica	Stercorarius skua

Evolutionary Relationship

Cliff Mining Bee and Great Skua share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Cliff Mining Bee

EX — Extinct

Great Skua

LC — Least Concern

Physical Characteristics

Attribute	Cliff Mining Bee	Great Skua
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Cliff Mining Bee

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Denmark, Luxembourg, Norway, and Sweden.

Great Skua

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Found across Europe (4 countries) and South America (Colombia, Venezuela).

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