PMID(sorted ascending)
a class of chaotic bird calls?evidence is presented that the basic vocalized sound produced by some cockatoos, specifically the australian sulfur-crested cockatoo (cacatua galerita) and the gang-gang cockatoo (callocephalon fimbriatum), has a chaotic acoustic structure rather than the harmonic structure characteristic of most birdsongs. these findings support those of fee et al. [nature (london) 395(3), 67-71 (1999)] on nonlinear period-doubling transitions in the song of the zebra finch (taeniopygia guttata). it is suggeste ...200010955649
mycobacteriosis in gang gang cockatoos (callocephalon fimbriatum).this report presents three cases of mycobacteriosis in gang gang cockatoos (callocephalon fimbriatum) that highlight the potential variation in clinical presentation of this important avian disease. the first case was a female gang gang cockatoo with widespread skeletal disease that presented with a chronic history of weight loss and nonpainful, bilaterally symmetric, distal-wing and leg nodular swellings. the second case was a mature female in good muscle condition with a nodular granulomatous ...200616931364
the haemagglutination spectrum of psittacine beak and feather disease virus.a simple method for concentrating psittacine beak and feather disease virus (pbfdv) from crude feather suspensions is described. the addition of 10% polyethylene glycol (mw 6000 to 9000) to feather suspensions facilitated the precipitation and pelleting of pbfdv by low speed centrifugation. pellets were resuspended in one-twentieth of the original volume with caesium chloride (cscl) buffer and subjected to isopycnic ultracentrifugation. peak haemagglutination activity (ha) occurred at 1.35 g/ml ...199418671129
the evolutionary history of cockatoos (aves: psittaciformes: cacatuidae).cockatoos are the distinctive family cacatuidae, a major lineage of the order of parrots (psittaciformes) and distributed throughout the australasian region of the world. however, the evolutionary history of cockatoos is not well understood. we investigated the phylogeny of cockatoos based on three mitochondrial and three nuclear dna genes obtained from 16 of 21 species of cacatuidae. in addition, five novel mitochondrial genomes were used to estimate time of divergence and our estimates indicat ...201121419232
neuroangiostrongyliasis due to angiostrongylus cantonensis in gang-gang cockatoos (callocephalon fimbriatum).four gang-gang cockatoos from an aviary in sydney displayed severe neurological signs. three were necropsied and histopathology of the brains and spinal cords revealed migrating nematodes, which were identified as angiostrongylus cantonensis. the migrating larval nematodes created tracts of malacia in the brain, but elicited little inflammatory cell infiltration. however, adult nematodes that had emerged onto the meningeal surface of the spinal cord evoked a marked non-suppurative reaction. deta ...201324571304
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