Ferruginous Pygmy-Owl (Glaucidium brasilianum)

2020 ◽  
Author(s):  
Glenn A. Proudfoot ◽  
R. Roy Johnson ◽  
Ray Larsen
Keyword(s):  
Glaucidium Brasilianum

scholarly journals Lightning predator: the Ferruginous Pygmy Owl snatches flower-visiting hummingbirds in southwestern Brazil

2015 ◽  
Vol 23 (1) ◽  
pp. 12-14 ◽  
Author(s):  
Ivan Sazima
Keyword(s):  
Stage I ◽  
Large Concentration ◽  
Hunting Success ◽  
Flower Visiting ◽  
Glaucidium Brasilianum

Abstract Pygmy owls of the genus Glaucidium prey on large insect and small vertebrates, mostly birds. Among the birds preyed on by pygmy owls are hummingbirds, caught mostly while mobbing these owlets or when still at nestling stage. I report here on the Ferruginous Pygmy Owl (Glaucidium brasilianum) snatching flower-visiting hummingbirds in an orchard at a farm in southwestern Brazil. I recorded one White-tailed Goldenthroat (Polytmus guainumbi) and three Gilded Hummingbirds (Hylocharis chrysura) preyed on by this owlet on three consecutive days. The large concentration of flowers and, consequently, of hummingbirds in the orchard likely contributed to the hunting success of the owlet on such fleeting and quickly moving prey. The role this pygmy owl plays on predation of adult hummingbirds in the Neotropics merits closer consideration.

Ear Tufts in Ferruginous Pygmy-Owl (Glaucidium brasilianum) as Alarm response

2008 ◽  
Vol 42 (2) ◽  
pp. 153-154
Author(s):  
Miguel Angel Santillan ◽  
Jose Hernán Sarasola ◽  
Marcelo Dolsan
Keyword(s):  
Alarm Response ◽  
Glaucidium Brasilianum

scholarly journals Local predation pressure predicts the strength of mobbing responses in tropical birds

2012 ◽  
Vol 58 (5) ◽  
pp. 781-790 ◽  
Author(s):  
Luis Sandoval ◽  
David R. Wilson
Keyword(s):  
Predation Pressure ◽  
Ecological Constraints ◽  
Tropical Birds ◽  
Factors Affecting ◽  
Seeking Safety ◽  
Risk Of Predation ◽  
Increased Risk ◽  
Adverse Environmental Conditions ◽  
Constraints Model ◽  
Glaucidium Brasilianum

Abstract Many birds join cooperative mobbing aggregations and collectively harass predators. Individuals participating in these ephemeral associations benefit by deterring the predator, but also incur energetic costs and increased risk of predation. Explaining the evolution of mobbing is challenging because individuals could prevail by selfishly seeking safety while allowing others to mob. An important step in understanding the evolution of mobbing is to identify factors affecting its expression. The ecological constraints model suggests that animals are more likely to cooperate under adverse environmental conditions, such as when local predation pressure is high. We tested this prediction by comparing the mobbing responses of several species of birds to the local abundance of their primary predator, the ferruginous pygmy-owl Glaucidium brasilianum. We used acoustic playback to elicit mobbing responses in environments where owls were common, uncommon, or rare. Stimuli were either the song of a ferruginous pygmy-owl or the mobbing calls of three of the owl’s common prey species. During each playback, we characterized mobbing responses by noting the number of species and individuals that approached the loudspeaker, as well as the closest approach by any bird. Mobbing responses to both stimuli were strong in locations where Ferruginous Pygmy-owls were common, intermediate where owls were uncommon, and weak where they were rare. This pattern persisted even after controlling for differences in species richness and composition among the three environments. Results support the ecological constraints model and provide strong evidence that intense predation pressure increases the expression of cooperative mobbing in tropical birds.

scholarly journals Ferruginous Pygmy-owl (Glaucidium brasilianum) predation on a mobbing Fork-tailed Flycatcher (Tyrannus savana) in south-east Brazil

2007 ◽  
Vol 7 (2) ◽  
pp. 321-324 ◽  
Author(s):  
José Carlos Motta-Junior
Keyword(s):  
Predation Risk ◽  
Body Mass ◽  
Bird Species ◽  
Large Prey ◽  
Predation Event ◽  
Glaucidium Brasilianum

I observed, and documented in detail, Ferruginous Pygmy Owl (Glaucidium brasilianum) predation on a mobbing Fork-tailed Flycatcher (Tyrannus savanna) in south-east Brazil. Events described in this account are supported with original photos. In addition to the predation event, I list 12 mobbing bird species that were alarmed by the presence of this raptor in the study area, including Trochilidae (Eupetomena macroura), Formicariidae (Formicivora rufa), Tyrannidae (Camptostoma obsoletum, Elaenia cristata, E. flavogaster, E. chiriquensis, T. savana, Myiarchus tyrannulus), Turdidae (Turdus leucomelas, T. amaurochalinus, T. rufiventris) and Emberizidae (Coryphospingus cucullatus). The Fork-tailed Flycatcher may represent 35-76.8% of the pygmy-owl body mass (41-80 g), which supports early reports about the predation on relatively large prey by this owl species. Although most authors have suggested that mobbing birds are subject to a low predation risk, this report and others confirmed that these events are not negligible and can be deadly dangerous to the mobbers, and conversely profitable to the raptor.

Mitochondrial DNA Variation and Phylogeography of the Ferruginous Pygmy-Owl (Glaucidium brasilianum)

2006 ◽  
Vol 7 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Glenn A. Proudfoot ◽  
Rodney L. Honeycutt ◽  
R. Douglas Slack
Keyword(s):  
Mitochondrial Dna ◽  
Dna Variation ◽  
Glaucidium Brasilianum

Development and characterization of microsatellite DNA primers for ferruginous pygmy-owls (Glaucidium brasilianum)

2005 ◽  
Vol 5 (1) ◽  
pp. 90-92 ◽  
Author(s):  
G. PROUDFOOT ◽  
R. HONEYCUTT ◽  
R. DOUGLAS SLACK
Keyword(s):  
Microsatellite Dna ◽  
Dna Primers ◽  
Glaucidium Brasilianum

Ferruginous Pygmy-Owl (Glaucidium brasilianum)

2000 ◽  
Author(s):  
Glenn A. Proudfoot ◽  
R. Roy Johnson
Keyword(s):  
Glaucidium Brasilianum

Variation in DNA microsatellites of the ferruginous pygmy-owl (Glaucidium brasilianum)

2006 ◽  
Vol 7 (6) ◽  
pp. 945-956 ◽  
Author(s):  
Glenn A. Proudfoot ◽  
Rodney L. Honeycutt ◽  
R. Douglas Slack ◽  
Michael F. Ingraldi
Keyword(s):  
Dna Microsatellites ◽  
Glaucidium Brasilianum

Observation of a Ferruginous Pygmy-Owl (Glaucidium brasilianum) Feeding Upon a Common Green Iguana (Iguana iguana) in Veracruz, Mexico

2018 ◽  
Vol 63 (1) ◽  
pp. 81
Author(s):  
Jorge A. Contreras-Lozano ◽  
Oscar Ballesteros-Medrano
Keyword(s):  
Iguana Iguana ◽  
Green Iguana ◽  
Glaucidium Brasilianum

Ferruginous Pygmy-Owl (Glaucidium brasilianum)

2000 ◽  
Author(s):  
Glenn A. Proudfoot ◽  
R. Roy Johnson
Keyword(s):  
Glaucidium Brasilianum
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