# Azores noctule

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The **Azores noctule** (***Nyctalus azoreum***) is a species of [bat](/source/Bat) found in the dry forests of the [Azores](/source/Azores). It is the only species of mammal [endemic](/source/Endemism) to the Azores. It has been recorded on most of the islands of the Azores, and remains common on some but is rare on others.[1] Its numbers are threatened due to [habitat loss](/source/Habitat_loss) caused by humans, and the remaining populations are quite fragmented. It is known to roost in hollowed-out trees, buildings, and caves.

The species is related to the widespread [lesser noctule](/source/Lesser_noctule), and in the past was treated as a subspecies of that species. Genetic studies have found that it originated recently from lesser noctules which colonised the Azores, and has low levels of genetic divergence from its parent species. It nevertheless is much smaller than the lesser noctule and weighs less, has darker fur and has a different frequency of echolocation calls (about 4–5 Hz higher), and is usually treated as a separate species.[2]

As opposed to other bats, the Azores noctule exhibits an unusually high frequency of diurnal flight, frequently hunting insects by day, although it is still most active at night.[3] It has been hypothesised that the Azores noctules' diurnal foraging behaviour may be due to the absence of [avian](/source/Bird) predators in the Azores. Azores noctules still seem to exhibit some anti-predator behaviour, such as leaving their roosting sites in groups, but this may be related to foraging behaviour or non-avian predators such as rats.[3]

## References

1. Salgueiro, P; Coelho, MM; Palmeirim, JM; Ruedi, M et al. (2004). "Mitochondrial DNA variation and population structure of the island endemic Azorean bat (*Nyctalus azoreum*)". *Molecular Ecology*. **13** (11): 3357–3366. [Bibcode:2004MolEc..13.3357S](https://ui.adsabs.harvard.edu/abs/2004MolEc..13.3357S). [doi:10.1111/j.1365-294X.2004.02354.x](https://doi.org/10.1111/j.1365-294X.2004.02354.x). [PMID 15487995](https://pubmed.ncbi.nlm.nih.gov/15487995)

1. Salgueiro, P; Ruedi, M; Coelho, MM; Palmeirim, JM (2006). "Genetic divergence and phylogeography in the genus *Nyctalus* (Mammalia, Chiroptera): implications for population history of the insular bat *Nyctalus azoreum*". *Genetica*. **130** (2): 169–181. [doi:10.1007/s10709-006-9004-x](https://doi.org/10.1007/s10709-006-9004-x). [PMID 16941086](https://pubmed.ncbi.nlm.nih.gov/16941086). [S2CID 21604786](https://api.semanticscholar.org/CorpusID:21604786)

1. Irwin N.R & Speakman J.R. (2003). ["Azorean bats *Nyctalus azoreum*, cluster as they emerge from roosts, despite the lack of avian predators"](http://www.abdn.ac.uk/ibes/speakman/pdf_docs/200.pdf). *Acta Chiropterologica*. **5** (2): 185–192. [doi:10.3161/001.005.0203](https://doi.org/10.3161/001.005.0203). [S2CID 13673687](https://api.semanticscholar.org/CorpusID:13673687). [Archived](https://web.archive.org/web/20091227122001/http://www.abdn.ac.uk/ibes/speakman/pdf_docs/200.pdf) 2009-12-27 at the Wayback Machine.

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Adapted from the Wikipedia article [Azores noctule](https://en.wikipedia.org/wiki/Azores_noctule) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Azores_noctule?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.