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Two sympatric species of passerine birds imitate the same raptor calls in alarm contexts
TLDR
This work shows that another passerine species, the Sri Lanka Magpie (Urocissa ornata), which inhabits the same Sri Lankan rainforest, imitates three of the same predator calls that drongos do, supporting the hypothesis that imitated predator calls can serve as signals of alarm to multiple species.
Birds Learn Socially to Recognize Heterospecific Alarm Calls by Acoustic Association
TLDR
It is shown experimentally that wild superb fairy-wrens, Malurus cyaneus, learn socially to recognize new alarm calls and can do so through the previously undemonstrated mechanism of acoustic-acoustic association of unfamiliar with known alarm calls.
Passive Integrated Transponders (PIT) on a small migratory passerine bird: absence of deleterious short and long-term effects
C. P. Ratnayake, C. Morosinotto, S. Ruuskanen, A. Villers & R. L. Thomson, Section of Ecology, Department of Biology, FIN 20014 University of Turku. * Corresponding author’s e-mail:
Vocal Mimicry of Alarm-Associated Sounds by a Drongo Elicits Flee and Mobbing Responses from Other Species that Participate in Mixed-Species Bird Flocks
TLDR
The results support the hypotheses that mobbing mimicry is a specific category of mimicry that helps attract the aid of heterospecifics during mobbing and that alarm mimicry can in some cases be beneficial to the caller.
Birds orient their heads appropriately in response to functionally referential alarm calls of heterospecifics
TLDR
This work shows that individuals can gain information on the type or location of danger from heterospecific alarm calls, which is likely to increase the effectiveness of antipredator responses.
Eavesdropping magpies respond to the number of heterospecifics giving alarm calls but not the number of species calling
Social information varies in its reliability and relevance, requiring individuals to use rules to avoid inappropriate responses to false information. A simple rule is to respond only when a certain
Personal information about danger trumps social information from avian alarm calls
TLDR
Compared with perched birds, those foraging on flowers were slower to spot gliding model predators, showing that foraging behaviour can affect predator detection, and nectar-foraging birds were more likely to flee to alarm call playbacks.
Food supplementation, but not predation risk, alters female antioxidant status during breeding
TLDR
It is suggested that food resources may have a stronger impact than predation risk on female antioxidant status during breeding, as the first fully experimental study focusing on the interactive effects of key environmental variables on antioxidant status in wild vertebrates suggests.
The frequency of vocal mimicry associated with danger varies due to proximity to nest and nesting stage in a passerine bird
TLDR
Of all the types of danger mimicry, imitation of predators was the most common and exclusive to drongos that had young offspring, and predator mimicry was observed at a higher rate during the hatchling and fledgling stages compared to incubation or flocks.
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