Bernd Heinrich's widely praised Bumblebee Economics (Harvard, 1979) set a high standard for scientifically accurate yet gracefully articulate writing about nature's ingenious patterns, specifically thermoregulation. His Hot-Blooded Insects takes giant step forward by presenting an overview of what is now known thermoregulation in all the major insect groups, offering new insights on physiology, ecology, and evolution. The book richly illustrated author's exquisite sketches. By describing...

The ability to follow gaze (i.e. head and eye direction) has recently been shown for social mammals, particularly primates. In most studies, individuals could use direction as a behavioural cue without understanding that the view of others may be different from their own. Here, we show hand-raised ravens not only visually co-orient with look-ups human experimenter but also reposition themselves experimenter's around visual barrier. Birds were capable co-orientation already fledglings...

Human social behaviour is influenced by attributing mental states to others. It debated whether and what extent such skills might occur in non-human animals. We here test for the possibility of ravens knowledge about location food potential competitors. In our experiments, we capitalize on mutually antagonistic interactions that these birds between those individuals store versus try pilfer caches. Since ravens' success depends memory observed caches, manipulated view at caching, thereby...

Data quality and especially the assessment of data have been intensively discussed in research practice alike. To support an economically oriented management decision making under uncertainty, it is essential to assess level by means well-founded metrics. However, if not adequately defined, these metrics can lead wrong decisions economic losses. Therefore, based on a decision-oriented framework, we present set five requirements for These are relevant metric that aims uncertainty. We further...

Abstract The aim of our study was to re‐examine the acquisition problem‐solving behaviour in ravens: accessing meat suspended from a perch by string. In contrast previous study, here we: (i) controlled for possible effects fear string, competition dominants, and social learning (ii) devised mechanically equivalent but non‐intuitive task test possibility means–end understanding. One‐year‐old ravens confronted with on string first time tried several ways reach food. However, five six birds...

Abstract Neophobia may constrain explorative behaviour, learning and innovation, while social context facilitate approach to novel objects acceptance of food. We examined the effects neophobia on exploration in relation ravens ( Corvus corax ). Ravens are suitable subjects for studying context, as they highly neophobic scavengers that recruit conspecifics tested two groups six 11 hand‐raised birds three conditions: single‐bird, dyadic combinations sibling sub‐groups birds. Contrary...

Due to the importance of using up-to-date data in information systems, this article analyzes how data-quality dimension currency can be quantified. Based on several requirements (e.g., normalization and interpretability) a literature review, we design procedure develop probability-based metrics for which adjusted specific characteristics attribute values. We evaluate presented with regard illustrate applicability as well its practical benefit. In cooperation major German mobile services...

Journal Article Why Do Ravens Fear Their Food? Get access Bernd Heinrich Department of Zoology, University Vermont, Burlington, VT 05405 Search for other works by this author on: Oxford Academic Google Scholar The Condor, Volume 90, Issue 4, 1 November 1988, Pages 950–952, https://doi.org/10.2307/1368859 Published: 01 1988 history Received: 16 March Accepted: 24 July

Journal Article Dispersal and Association among Common Ravens Get access Bernd Heinrich, Heinrich Department of Zoology University Vermont, Burlington, VT 05405 Search for other works by this author on: Oxford Academic Google Scholar Delia Kaye, Kaye M 4 Gardenside, Shelburne,VT 05482 Ted Knight, Knight Box 4425, Wolcott, 05680 Kristin Schaumburg 616 King Ave., Bronx, New York, NY 10464 The Condor, Volume 96, Issue 2, 1 May 1994, Pages 545–551, https://doi.org/10.2307/1369334 Published: 01...

Journal Article Age and Mouth Color in Common Ravens Get access Bernd Heinrich, Heinrich Department of Zoology, University Vermont, Burlington, VT 05405 Search for other works by this author on: Oxford Academic Google Scholar John Marzluff Greenfalk Consultants, 8210 Gantz, Boise, ID 83709 The Condor, Volume 94, Issue 2, 1 May 1992, Pages 549–550, https://doi.org/10.2307/1369233 Published: 01 1992 history Received: 23 October 1991 Accepted: 19 December