Search for dissertations about: "Parrots"

Found 5 swedish dissertations containing the word Parrots.

  1. 1. Spatial Vision in Birds: Anatomical investigation of spatial resolving power

    University dissertation from Department of Biology, Lund University

    Author : Mindaugas Mitkus; Lund University.; Lunds universitet.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Raptors; Seabirds; Parrots; Birds; Double cones; Development; Retinal ganglion cells; Visual spatial resolution; Visual ecology; Vision;

    Abstract : Avian eyes are big both in relative and absolute terms, thus the importance of vision to birds is obvious. Even though the general eye plan is rather conservative throughout the group, there is a great variation in visual capabilities. READ MORE

  2. 2. Comparative Avian Cognition : Physical and Social Problem Solving in Corvids and Parrots

    University dissertation from University of York

    Author : Megan Lambert; [2016-10-21]

    Abstract : Within the last few decades, investigations of problem solving in avian species such as corvids have challenged the few that complex cognitive abilities are unique to the primate lineage, and provide a compelling case for the convergent evolution of cognition in a range of large-brained, socially complex species. Despite these advances, there is still much that is unknown about how corvids acquire and use information to solve problems in both their social and physical environments, and comparably little research has focused on other large-brained avian taxa such as parrots. READ MORE

  3. 3. Bird Vision: Spatial acuity and colour discrimination in bright and dim light

    University dissertation from Department of Biology, Lund University

    Author : Olle Lind; Lund University.; Lunds universitet.; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Animal vision; Visual ecology; Colour vision; Spatial acuity; Spatial contrast sensitivity; Dim light; Visual modelling; Behavioural experiments; Birds; Psittaciformes;

    Abstract : Birds use vision to guide navigation, foraging and mate choice, and studies of the limitations in bird visual perception are most helpful for the understanding of bird ecology. Here, I present four studies of bird vision in bright and dim light. READ MORE

  4. 4. Planning and inhibition in corvids

    University dissertation from mediatryck, Lund University

    Author : Can Kabadayi; Lund University.; Lunds universitet.; [2017-08]
    Keywords : HUMANIORA; HUMANITIES; executive functions; corvids; evolution of cognition; planning; inhibitory control; homoplasy;

    Abstract : Executive functions (EF) denote the host of top-down mental processes that mediate self-regulation to achieve a goal. Among other things, EF support cognitive flexibility by allowing inhibition of automatic responses in favour of obtaining future goals. READ MORE

  5. 5. Comparative studies of cognitive abilities in the Paridae : Evidence from laboratory studies

    University dissertation from Lund University, Faculty of Science, Department of Biology

    Author : Utku Urhan; Lund University.; Lunds universitet.; [2017-09]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Comparative cognition; Spatial memory; Food hoarding; Observational spatial memory; motor self-regulation; Cognitive sex differences; foraging strategies;

    Abstract : The Paridae (tits, titmice and chickadees) is a bird family consisting of both food hoarding and non-hoarding species. Many studies have been conducted on birds that are considered to be cognitively advanced, such as parrots and corvids, whereas much less is known about these small passerines. READ MORE