Introduction 1 Historical review 2 Materials and methods 3 Taxonomic studies 4 Life history 8 Preparasitie stages 8 Parasitic stages 10 Effects of environment on eggs and larvae.-_ 10 Eggs 10 Firstand second-stage larvae 11 Infective larvae 11 Host-parasite relations— 15 Parasitic stages in pigeons of different breeds 15 Host-parasite relations—Continued. ^^g^ Attempted infestation of other spe...

1. The horizontal and vertical vestibuloocular reflex (HVOR and VVOR, respectively) was studied in four chronically instrumented pigeons. Eye movements were measured using the magnetic search-coil technique and were produced by rotation in the dark. During the rotation paradigms, the pigeons were either pharmacologically aroused (using amphetamine) or drug free (normal). The pigeon HVOR and VVO...

Homing pigeons are known for their excellent homing ability, and their brains seem to be functionally adapted to homing. It is known that pigeons with navigational experience show a larger hippocampus and also a more lateralised brain than pigeons without navigational experience. So we hypothesized that experience may have an influence also on orientation ability. We examined two groups of pige...

Aortic smooth muscle cells from atherosclerosis-susceptible White Carneau (WC) pigeons lack a functional low density lipoprotein (LDL) receptor pathway. The purpose of the present study was to determine if atherosclerosis-resistant Show Racer pigeons (SR) shared this lack of an LDL receptor pathway and if LDL from normal and hypercholesterolemic pigeons were metabolized similarly. The amount of...

Two commonly accepted functions of the mammalian hippocampus are the processing of spatial information and behavioral inhibition. Although there is clear evidence that the avian hippocampus is also critical for the processing of spatial information, there is a dearth of evidence that it plays a role in behavioral inhibition. In Experiment 1, the effect of hippocampal lesions on behavioral inhib...

The relative importance of an internal sense of direction based on inertial cues and landmark piloting for small-scale navigation by White King pigeons (Columba livia) was investigated in an arena search task. Two groups of pigeons differed in whether they had access to visual cues outside the arena. In Experiment 1, pigeons were given experience with 2 different entrances and all pigeons trans...

In delayed matching to sample, once acquired, pigeons presumably choose comparisons according to their memory for (the strength of) the sample. When memory for the sample is sufficiently weak, comparison choice should depend on the history of reinforcement associated with each of the comparison stimuli. In the present research, pigeons acquired two matching tasks in which Sample S1 was associat...

In combinatorics, Ramsey Theory considers partitions of some mathematical objects and asks the following question: how large must the original object be in order to guarantee that at least one of the parts in the partition exhibits some property? Perhaps the most familiar case is the well-known Pigeonhole Principle: if m pigeonholes house p pigeons where p m, then one of the pigeonholes must co...

Pigeons show suboptimal choice on a gambling-like task similar to that shown by humans. Humans also show a preference for gambles in which there are near hits (losses that come close to winning). In the present research, we asked if pigeons would show a preference for alternatives with near-hit-like trials. In Experiment 1, we included an alternative that presented a near hit, in which a stimul...

Background: Mycoplasma is one of the most important pathogens of respiratory system in poultry. OBJECTIVES: The aim of the present study was to identify Mycoplasma spp. isolated from pigeons. METHODS: Sixteen pooled samples were provided and cultured on PPLO medium and finally the DNA was extracted from the resulting single colonies. RESULTS: Through 16S rRNA gene amplification Mycoplasma genus...