In August 2025, our AI bioacoustic probe on the Mühlriegel near Arnbruck (Bavarian Forest) recorded 839 Bird calls a living signal for the high ecological quality of the 5,000 m² protection area.
At a glance
- Location: Mühlriegel, Bavarian Forest
- Period: August 2025
- Evidence: 839 acoustic detections
- Number of species: 16 bird species
- Most common species:
- Fir tit (390)
- Robin (213)
- Chiffchaff (113)
- Blackcap (31)
- Redwing (last Aug. 31, 5 p.m., 98.4 %)
🎧 Snapshot: Yellowhammer, August 12, 2025, 05:04 - Listen to audio
Hula AI monitoring: How we make biodiversity audible
Our sensors record the sound of the forest around the clock.
An integrated AI identifies species directly on site („edge processing“) and only transmits the results - energy-saving, data-saving and solar-powered. Microclimate sensors for temperature, humidity and CO₂ provide additional information on the Resilience of the ecosystem.
Results: A forest in balance
The most common species show a clear vertical use of the habitat:
- Crown layer: Fir tit (390), blackcap (31)
- Shrub and middle floor: Chiffchaff (113)
- Soil layer: Robin (213), wren (11), song thrush (8)
- Bark and cave dwellers: Garden treecreeper (5), nuthatch (4), pied flycatcher (8)
This distribution shows: The forest is Structurally rich and functionally filled - from the crown to the ground. The evidence of the pied flycatcher in particular, a cavity-nesting species, demonstrates the value of old trees and near-natural structures.
Interpretation
Each species fulfills an ecological function: insect regulation, seed dispersal or nutrient cycles. Together they form a Stable, resilient system. The low number of great tits (3) is striking - an indicator that specialized species dominate here and that the influence of human settlements is low.
Conclusion and outlook
The August 2025 monitoring shows: The Mühlriegel is acoustically alive and ecologically intact. Our AI-supported bioacoustics provide objective data to make biodiversity measurable and to understand natural processes in the long term.
In the fall, migratory movements and changing activity patterns will change the soundscape again - we'll keep listening.
Read more:
- How it all began: Sensor construction and responsibility at Mühlriegel
- High-tech meets nature - the first evaluations
