| problem solving skills in young yellow-crowned parakeets (cyanoramphus auriceps). | despite the long divergent evolutionary history of birds and mammals, early avian and primate cognitive development have many convergent features. some of these features were investigated with a series of tasks designed to assess human infant development. the tasks were presented to young parakeets to assess their means-end problem solving abilities. examples of these early skills are: attaining and playing with objects, retrieving rewards through use of a stick or rake, or by pulling in rewards ... | 2002 | 12357289 |
| novel ssdna viruses discovered in yellow-crowned parakeet (cyanoramphus auriceps) nesting material. | during routine monitoring of yellow-crowned parakeets in the poulter valley of the south island of new zealand, a dead parakeet chick was discovered in a nest. known parrot-infecting viruses, such as beak and feather disease virus (bfdv), avian polyomavirus (apv), and parrot hepatitis b virus (phbv), were not detected in the nesting material. however, we recovered two novel single-stranded dna viruses (ssdna), cynncxv (2308 nt) and cynnckv (2087 nt), which have genome architectures similar to th ... | 2013 | 23417396 |
| molecular characterisation of beak and feather disease virus (bfdv) in new zealand and its implications for managing an infectious disease. | beak and feather disease virus (bfdv) infections are often fatal to both captive and wild parrot populations. its recent discovery in a wild population of native red-fronted parakeets has raised concerns for the conservation of native parrots, all of which are threatened or endangered. the question of a recent introduction versus a native genotype of the virus poses different conservation-management challenges, and thus, a clear understanding of the molecular phylogeny of bdfv is a crucial step ... | 2012 | 22638639 |
| stable individual differences on developmental tasks in young yellow-crowned parakeets, cyanoramphus auriceps. | we report on stable individual differences in young yellow-crowned parakeets across 38 tasks of cognitive development on three scales involving object permanence, means-end relations, and spatial relations. stable performance ranks on blocks of tasks emerged after 13 weeks in two groups of sibling parakeets, one hand-reared and the other parent-reared. examination of subject characteristics, such as hatch order, sex, general activity level, avoidances, latencies, social status, and errors, showe ... | 2004 | 15825884 |