BACKGROUND Tracks of pigeons homing to the Frankfurt loft revealed an odd phenomenon: whereas birds returning from the North approach their loft more or less directly in a broad front, pigeons returning from the South choose, from 25 km from home onward, either of two corridors, a direct one and one with a considerable detour to the West. This implies differences in the navigational process. ...

Mature and immature stages of Haemoproteus columbae gametocytes, an avian haemosporidian protozoan parasite were found in 75% of blood smears prepared from 30 healthy domestic pigeons in Sebele location, Gaborone, Botswana. Parenteral administration of an immuno-suppressive dose of dexamethasone, lowered the level of parasitaemia, the packed cell volume and the heterophil:lymphocyte ratio in th...

In 2018, an outbreak resulting in deaths of 28 breeding pigeons was reported north Brisbane, Australia. The affected birds had runny nasal discharge and poor body condition. Two were submitted to Biosecurity Sciences Laboratory, for investigation. A range diagnostic tests excluded a number known pathogens, no virus isolated cell culture. Histopathological examination revealed severe acute multi...

Classical growth functions used in animals are nonlinear form. Various numerical methods have been developed to estimate parameters functions. In this paper, the discrete-time stochastic Gompertz model for Adana pigeons is considered. It assumed that parameter time-varying. The time-varying estimation of was made using adaptive Kalman filter (AKF). aim study investigate whether and method handl...

Repeated pairings of a particular visual context with a specific location of a target stimulus facilitate target search in humans. We explored an animal model of such contextual cueing. Pigeons had to peck a target, which could appear in 1 of 4 locations on color photographs of real-world scenes. On half of the trials, each of 4 scenes was consistently paired with 1 of 4 possible target locatio...

INTRODUCTION It had been shown (Matthews, 19516) that reasonably accurate orientation and homing could be obtained with young pigeons after a minimal training up to 25 miles. Recently Kramer & St Paul (1952) and Kramer (1953) have obtained similar results with older pigeons trained up to 10 miles only. Training thus appeared to be rather less essential than had been supposed, and to investigate...

Pigeons and humans were required to discriminate coherent from random motion in dynamic random dot displays. Coherence and velocity thresholds were determined for both species, and both thresholds were found to be substantially higher for pigeons than for humans. The results are discussed with reference to differences in motion processing in mammals and birds. It is suggested that the inferior ...

In four experiments, we evaluated Lea's (1984) reassignment procedure for studying object representation in pigeons (Experiments 1-3) and humans (Experiment 4). In the initial phase of Experiment 1, pigeons were taught to make discriminative button responses to five views of each of four objects. Using the same set of buttons in the second phase, one view of each object was trained to a differe...

PURPOSE Establishment of regional longitudinal (T1 ) and transverse (T2 ) relaxation times in awake pigeons and rats at 7T field strength. Regional differences in relaxation times between species and between two different pigeon breeds (homing pigeons and Figurita pigeons) were investigated. METHODS T1 and T2 relaxation times were determined for nine functionally equivalent brain regions in a...

AnsraAcT.-Morphometric studies of Rock Doves and feral pigeons (Columba livia) are enhanced by knowing that variation in size and shape has a well-studied genetic causation in domestic pigeons. Size distributions of skeletal elements of the sexes approximate normality; males are significantly larger than females. Size as measured by principal component I of feral females shows significant inter...