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civil twilight
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REVEIL 2025 STREAMS




Live stream: roztoky_tiche-udoli.mp3

Recording: Dawn Chorus Day 2021 - Martina Valášková

Tiché údolí, Roztoky, Czech Republik

Muzeum of Prague

Latitude: +50.14825859846911°
Longitude: +14.375099745867894°

Tiché údolí, part of the Roztocký háj – Tiché údolí nature reserve, is located between Prague and the town of Roztoky.

It is a peaceful natural area where the sounds of birdsong and ambient nature mix with occasional human activity, distant train echoes, and normally also air traffic. However, no aircraft will be heard during the stream, as the main runway (06/24) will be temporarily closed.
Soundcamp with name "Zvuky svítání v Tichém údolí" is scheduled for Sunday, May 4th, 2025, from 04:00 to 06:00 at dawn, in Tiché údolí (Quiet Valley), a protected natural area just outside Prague.

The meeting point is at 4:00–4:10 AM at the edge of the valley, near the Maxmiliánka bus stop in Roztoky. Due to limited public transport at that hour, we organize carpooling via Google Sheets (shared after registration). Taxis are also recommended.

The workshop is open to 15 participants.
Tickets: eshop.muzeumprahy.cz/ticket/detail/11916

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As part of the global Dawn Chorus Day and Soundcamp 2025, we will gather shortly before sunrise, in darkness, allowing time for technical setup and quiet orientation. The event is designed to capture the dramatic rise in morning sound: a transition from the subtle geophony of the stream and rustling leaves to the powerful spring biophony of birdsong at daybreak. We will listen, record, and reflect on the changing soundscapes of this unique valley. Participants will experience the early morning biophony and learn the basics of acoustic ecology, field recording, and spectrogram reading. Various types of recording devices will be available on-site. We will also introduce ways to contribute to citizen science by uploading recordings to international databases such as the Dawn Chorus platform.

The event highlights the importance of long-term soundscape monitoring in the context of global environmental change. By joining this network of listening sites around the world, we aim to draw attention to the state of ecosystems and promote collective awareness through sound.

The programme includes a deep listening session, small group recording activities, and informal discussions with ornithologists and fellow participants about the role of sound in biodiversity research. There will be a shared informal breakfast at the end of the session. The museum will provide hot tea and coffee; participants are welcome to bring their own cups and something small to share (fruit, pastries, bread, etc.). 

A live stream from the site will be included in the global Reveil 2025 broadcast. 


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The soundscape of Tiché údolí is shaped primarily by birdsong and the flowing stream that runs through the valley, accompanied by other natural ambient sounds such as rustling leaves and distant barking dogs. In the early morning hours, the location is quiet and dominated by biophony. Unlike usual conditions, no aircraft will be audible during the stream, due to the temporary closure of the nearby airport’s main runway. Later in the day, the soundscape may also feature anthropophonic elements like distant trains and occasional human activity (e.g. joggers, walkers), but these will not likely be present during the dawn broadcast.

The structure of the bird community in Tiché údolí reflects the natural conditions and the mosaic of habitats that shape its diversity. The dominant group consists of small songbirds such as the common chaffinch (Fringilla coelebs) and the Eurasian blackbird (Turdus merula), supported by deciduous vegetation in the cooler riparian zone as well as by drier woodlands on adjacent slopes. Scattered coniferous stands further enhance bird diversity, providing suitable habitat for species such as the crested tit (Lophophanes cristatus), the goldcrest (Regulus regulus), the firecrest (Regulus ignicapilla), and the Eurasian siskin (Spinus spinus).

While raptors and owls are not abundant, the tawny owl (Strix aluco) is regularly heard. The area’s open pastures, meadows interspersed with tree groups, orchards, and sparse forest edges offer ideal conditions for the Eurasian hoopoe (Upupa epops). By 2022, a total of 43 bird species had been confirmed, most of which are closely associated with the site's natural habitats.

Wet meadows and reedbeds in the stream’s floodplain host numerous invertebrate species, including ground beetles like Nebria brevicollis and Ocydromus tibialis, as well as the leaf beetle Prasocuris junci and the flea beetle Hippuriphila modeeri. The rare aquatic snail Perforatella bidentata is also present. Among vertebrates, the gudgeon (Gobio gobio) occurs in the stream, and the fire salamander (Salamandra salamandra) is known to reproduce here. On sun-exposed, open habitats, individuals of the Hercynian population of the green lizard (Lacerta viridis) are commonly observed.

Since 2021, the presence of the European beaver (Castor fiber) has been confirmed in the area, with individuals actively building dams along the stream.
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