Cryptosporidia are 5-7-mm apicomplexid coccidian parasites that infect humans and many other species of mammals, birds, reptiles, and fish. In humans and cattle, infection by Cryptosporidium parvum usually affects the intestinal tract, resulting in self-limiting diarrhea.4 Respiratory and intestinal cryptosporidiosis occur in birds infected with C. bayleyi and C. meleagridis.5 Sneezing, coughin...

Zebra finch (Taeniopygia guttata) song syllables often include harmonically related frequency components. These harmonics may be suppressed, and this differential emphasis varies between the syllables in a song and between individual birds' songs. These patterns of harmonic suppression are timbre. Individual syllables' patterns of harmonic suppression are constant with adult males' songs. Young...

Fast moving animals depend on cues derived from the optic flow on their retina. Optic flow from translational locomotion includes information about the three-dimensional composition of the environment, while optic flow experienced during a rotational self motion does not. Thus, a saccadic gaze strategy that segregates rotations from translational movements during locomotion will facilitate extr...

We examined how 61 young zebra finch (Taeniopygia guttata) males copied song from 5 adult tutors. Zebra finch song consists of a string of 5-15 distinct syllables, and these syllables were copied as chunks, or strings of consecutive syllables (modal length = 3). The silent interval between 2 syllables was copied as part of the syllable after the silence. Copied chunks had boundaries that fell a...