Results 31 to 40 of about 7,494 (204)

Cognition As a Natural Kind [PDF]

open access: yesOrganon F
In corvids and apes, cognition evolved convergently instead of being inherited by a shared ancestor. In biology, natural kinds are classified according to common ancestry.
Selen Fettahoğlu
doaj   +1 more source

Chlamydiae in corvids

open access: yesVeterinary Record, 2015
AVIAN chlamydiosis is primarily caused by the intracellular bacterium Chlamydia psittaci , belonging to the Chlamydiaceae family. Depending on the species and age of the bird and the virulence of the infectious bacterial strain, avian chlamydiosis can be subclinical or characterised by respiratory, digestive, or systemic disorders (Knittler and others ...
DI FRANCESCO, ANTONIETTA   +7 more
openaire   +4 more sources

Mortality associated with avian reovirus infection in a free-living magpie (Pica pica) in Great Britain [PDF]

open access: yes, 2015
Avian reoviruses (ARVs) cause a range of disease presentations in domestic, captive and free-living bird species. ARVs have been reported as a cause of significant disease and mortality in free-living corvid species in North America and continental ...
Cunningham, AA   +9 more
core   +1 more source

Abstract knowledge in the broken-string problem : evidence from nonhuman primates and pre-schoolers [PDF]

open access: yes, 2014
There was funding from the Royal Commission for the Exhibition of 1851.There is still large controversy about whether abstract knowledge of physical problems is uniquely human.
Albiach-Serrano, Anna   +5 more
core   +4 more sources

Beyond Scatter-Hoarding and Frugivory: European Corvids as Overlooked Vectors for a Broad Range of Plants

open access: yesFrontiers in Ecology and Evolution, 2019
It is well-known that some members of the crow family (Corvidae) are important for seed dispersal either via frugivory (e.g., when feeding on berries) or by scatter hoarding (e.g., of nuts). Dispersal via gut passage of seeds within a fleshy fruit can be
Andy J. Green   +2 more
doaj   +1 more source

Carrion crows (Corvus corone) of southwest Germany: important hosts for haemosporidian parasites

open access: yesMalaria Journal, 2017
Background Avian malaria parasites (Plasmodium spp.) and other Haemosporida (Haemoproteus and Leucocytozoon spp.) form a diverse group of vector-transmitted blood parasites that are abundant in many bird families.
Sandrine Schmid   +4 more
doaj   +1 more source

Threat-sensitive anti-predator defence in precocial wader, the northern lapwing Vanellus vanellus [PDF]

open access: yes, 2016
Birds exhibit various forms of anti-predator behaviours to avoid reproductive failure, with mobbing—observation, approach and usually harassment of a predator—being one of the most commonly observed. Here, we investigate patterns of temporal variation in
A Amar   +97 more
core   +1 more source

Nest predation in Afrotropical forest fragments shaped by inverse edge effects, timing of nest initiation and vegetation structure [PDF]

open access: yes, 2014
High levels of nest predation influence the population dynamics of many tropical birds, especially when deforestation alters nest predator communities. The consequences of tropical forest fragmentation on nest predation, however, remain poorly understood,
Callens, Tom   +4 more
core   +2 more sources

Collective roost of corvids in Melitopol (Zaporozhye region) in 2014–2015

open access: yesVìsnik Dnìpropetrovsʹkogo Unìversitetu: Serìâ Bìologìâ, Ekologìâ, 2016
The article contains the results of observations on the formation, existence and the dissociation of the collective winter roost of corvids (crow species) in 2014–2015 in Melitopol (Zaporozhye region).
A. О. Dranga, P. I. Gorlov
doaj   +1 more source

Webcams as a Remote Tool for Eco-ethological Research: A Study on the Alpine Chough

open access: yesFrontiers in Environmental Science, 2021
Methods and devices specifically created for remote animal surveys and monitoring are becoming increasingly popular and effective. However, remote devices are also widely used in our societies for different, not scientific, goals.
Cristina Vallino   +4 more
doaj   +1 more source

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