Hooded Crows (Corvus cornix) May Be Aware of Their Own Body Size

Body-awareness is one of the manifestations of self-awareness, expressed in the ability of people and animals to represent their own body physical properties. Relatively little work has been devoted to this phenomenon in comparison with the studies of the ability of self-recognition in the mirror, and most studies have been conducted on mammals and human infants. Crows are known to be “clever” birds, so we investigated whether hooded crows (Corvus cornix) may be aware of their own body size. We set up an experimental design in which the crows had to pass through one of three openings to reach the bait. In the first experiment, we studied whether crows prefer a larger hole if all the three are suitable for passage, and what other predictors influence their choice. In the second experiment, we assessed the ability of the crows to select a single passable hole out of three on the first attempt, even though the area of the former was smaller than that of the other two. The results of the first experiment suggest that when choosing among three passable holes, crows prefer those holes that require less effort from them, e.g., they do not need to crouch or make other additional movements. In the second experiment, three of the five crows reliably more often chose a single passable hole on the first try, despite its smaller size. We believe that these results suggest that hooded crows may be aware of their own body size.

A Sentinel Serological Study in Selected Zoo Animals to Assess Early Detection of West Nile and Usutu Virus Circulation in Slovenia

Monitoring infectious diseases is a crucial part of preventive veterinary medicine in zoological collections. This zoo environment contains a great variety of animal species that are in contact with wildlife species as a potential source of infectious diseases. Wild birds may be a source of West Nile virus (WNV) and Usutu (USUV) virus, which are both emerging pathogens of rising concern. The aim of this study was to use zoo animals as sentinels for the early detection of WNV and USUV in Slovenia. In total, 501 sera from 261 animals of 84 animal species (including birds, rodents, lagomorphs, carnivores, ungulates, reptiles, equids, and primates) collected for 17 years (2002–2018) were tested for antibodies to WNV and USUV. Antibodies to WNV were detected by indirect immunofluorescence tests in 16 (6.1%) of 261 animals representing 10 species, which were sampled prior to the first active cases of WNV described in 2018 in Slovenia in humans, a horse, and a hooded crow (Corvus cornix). Antibodies to USUV were detected in 14 out of 261 animals tested (5.4%) that were positive prior to the first positive cases of USUV infection in common blackbirds (Turdus merula) in Slovenia. The study illustrates the value of zoological collections as a predictor of future emerging diseases.

Population dynamics and habitat preference of two urbanized Columbidae species and their nest predator in two settlement types

Since urbanization is a worldwide phenomenon, numerous species have gained the advantage of urban ecosystems. The Eurasian Collared Doves (Streptopelia decaocto) has become widespread all across Europe along with human-altered habitats. In general, population levels are stable but numbers have locally decreased in the past few decades. In parallel, a new wave of urbanization came forward, so Wood Pigeons (Columba palumbus) entered urban ecosystems alongside with other Columbidae species. In this paper, our primary goal was to find any connection between habitat availability factors such as coniferous tree density and the population dynamics of two urbanized species. A locally emerging corvid species, the Hooded Crow (Corvus cornix) was also taken into consideration in influencing tree-nesting doves and pigeons as a primary nest predator. During the research period, we aimed to express the differences in habitat structure of two urban ecotypes by nesting tree availability and structure and to prove the power of predator presence in sampling sites. Our results showed that residential areas have a higher proportion of coniferous trees, as well as the high preference of residential areas by Wood Pigeons and Eurasian Collared Doves.

Molecular characterization of the re-emerging West Nile virus in avian species and equids in Israel, 2018, and pathological description of the disease

Background In this report we describe the molecular and pathological characteristics of West Nile virus (WNV) infection that occurred during the summer and fall of 2018 in avian species and equines. WNV is reported in Israel since the 1950s, with occasional outbreaks leading to significant morbidity and mortality in birds, high infection in horses and humans, and sporadic fatalities in humans. Methods Animal and avian carcasses in a suitable condition were examined by post-mortem analysis. Tissue samples were examined for WNV by RT-qPCR and the viral load was quantified. Samples with sufficient material quality were further analyzed by Endpoint PCR and sequencing, which was used for phylogenetic analysis. Tissue samples from positive animals were used for culturing the virus in Vero and C6/36 cells. Results WNV RNA was detected in one yellow-legged gull (Larus michahellis), two long-eared owls (Asio otus), two domesticated geese (Anser anser), one pheasant (Phasianus colchicus), four hooded crows (Corvus cornix), three horses and one donkey. Pathological and histopathological findings were characteristic of viral infection. Molecular analysis and viral load quantification showed varying degrees of infection, ranging between 70–1.4 × 106 target copies per sample. Phylogenetic analysis of a 906-bp genomic segment showed that all samples belonged to Lineage 1 clade 1a, with the following partition: five samples from 2018 and one sample detected in 2016 were of Cluster 2 Eastern European, two of Cluster 2 Mediterranean and four of Cluster 4. Four of the positive samples was successfully propagated in C6/36 and Vero cell lines for further work. Conclusions WNV is constantly circulating in wild and domesticated birds and animals in Israel, necessitating constant surveillance in birds and equines. At least three WNV strains were circulating in the suspected birds and animals examined. Quantitative analysis showed that the viral load varies significantly between different organs and tissues of the infected animals.

Multi-domain Collection Management Simplified — the Finnish National Collection Management System Kotka

Many natural history museums share a common problem: a multitude of legacy collection management systems (CMS) and the difficulty of finding a new system to replace them. Kotka is a CMS developed starting in 2011 at the Finnish Museum of Natural History (Luomus) and Finnish Biodiversity Information Facility (FinBIF) (Heikkinen et al. 2019, Schulman et al. 2019) to solve this problem. It has grown into a national system used by all natural history museums in Finland, and currently contains over two million specimens from several domains (zoological, botanical, paleontological, microbial, tissue sample and botanic garden collections). Kotka is a web application where data can be entered, edited, searched and exported through a browser-based user interface. It supports designing and printing specimen labels, handling collection metadata and specimen transactions, and helps support Nagoya protocol compliance. Creating a shared system for multiple institutions and collection types is difficult due to differences in their current processes, data formats, future needs and opinions. The more independent actors there are involved, the more complicated the development becomes. Successful development requires some trade-offs. Kotka has chosen features and development principles that emphasize fast development into a multitude of different purposes. Kotka was developed using agile methods with a single person (a product owner) making development decisions, based on e.g., strategic objectives, customer value and user feedback. Technical design emphasizes efficient development and usage over completeness and formal structure of the data. It applies simple and pragmatic approaches and improves collection management by providing practical tools for the users. In these regards, Kotka differs in many ways from a traditional CMS. Kotka stores data in a mostly denormalized free text format and uses a simple hierarchical data model. This allows greater flexibility and makes it easy to add new data fields and structures based on user feedback. Data harmonization and quality assurance is a continuous process, instead of doing it before entering data into the system. For example, specimen data with a taxon name can be entered into Kotka before the taxon name has been entered into the accompanying FinBIF taxonomy database. Example: simplified data about two specimens in Kotka, which have not been fully harmonized yet. Taxon: Corvus corone cornix Country: FI Collector: Doe, John Coordinates: 668, 338 Coordinate system: Finnish uniform coordinate system Taxon: Corvus corone cornix Country: FI Collector: Doe, John Coordinates: 668, 338 Coordinate system: Finnish uniform coordinate system Taxon: Corvus cornix Country: Finland Collector: Doe, J. Coordinates: 60.2442, 25,7201 Coordinate system: WGS84 Taxon: Corvus cornix Country: Finland Collector: Doe, J. Coordinates: 60.2442, 25,7201 Coordinate system: WGS84 Kotka’s data model does not follow standards, but has grown organically to reflect practical needs from the users. This is true particularly of data collected in research projects, which are often unique and complicated (e.g. complex relationships between species), requiring new data fields and/or storing data as free text. The majority of the data can be converted into simplified standard formats (e.g. Darwin Core) for sharing. The main challenge with this has been vague definitions of many data sharing formats (e.g. Darwin Core, CETAF Specimen Preview Profile (CETAF 2020), allowing different interpretations. Kotka trusts its users: it places very few limitations on what users can do, and has very simple user role management. Kotka stores the full history of all data, which allows fixing any possible errors and prevents data loss. Kotka is open source software, but is tightly coupled with the infrastructure of the Finnish Biodiversity Information Facility (FinBIF). Currently, it is only offered as an online service (Software as a Service) hosted by FinBIF. However, it could be developed into a more modular system that could, for example, utilize multiple different database backends and taxonomy data sources.

Comparison of population densities of selected bird species breeding in main urban habitats in southwestern Poland

A simplified version of the territory mapping method was used. Four counts were conducted in a fragment of the city of Wrocław in the spring and early summer 2010. Two main urban habitats were distinguished: a densely built-up area with block buildings and a residential area with flat houses. In total, 44 bird species were recorded as breeding in the whole study area. Five species nested in a density higher than 10 pairs per 100 ha each: Columba palumbus, Pica pica, Streptopelia decaocto, Sylvia atricapilla, and Turdus merula. Whereas in the densely built-up areas Columba palumbus and Streptopelia decaocto were equally common, in the residential area Streptopelia decaocto was almost three times more common than Columba palumbus. Pica pica was about three times more common than Corvus cornix both in the builtup areas and in the residential areas. Although densely built-up areas and residential areas have a similar species composition, many species breed in different densities. This is probably due to a different structure of vegetation. While tall trees are relatively common and shrubs rare in the densely built-up areas, the reverse situation prevails in residential areas.

Особенности размножения птиц зеленых насаждений города Сыктывкара

Изучены особенности гнездовой биологии двух видов дуплогнездников (полевого воробья – Passer montanus L. и мухоловки-пеструшки – Ficedula hypoleuca Pall.) и шести видов открытогнездящихся птиц (белой трясогузки – Motacilla alba L., дрозда-белобровика – Turdus iliacus L., дрозда-рябинника – Turdus pilaris L., серой вороны – Corvus cornix L., грача – C. frugilegus L. и сороки – Picapica L.) в условиях зеленых насаждений г. Сыктывкара и его окрестностей. Показано, что в условиях культурного ландшафта, как и в природных экосистемах, наблюдается межвидовая, сезонная и годовая изменчивость успешности размножения. Изменчивость показателей успешности размножения у разных видов зависела от совокупного действия хищничества (66–75 % общей гибели яиц и птенцов) и эмбриональной смертности (25–60 % гибели яиц и птенцов). В городе на успешность размножения птицбольшое влияние оказывает деятельность человека (25 % общей гибели яиц и птенцов), к которой, главным образом, относятся технические мероприятия, прямое разорение гнезд.