. Bulletin of the British Ornithologists' Club. Birds. 67 kHz 4 [ 1986 106(2)] D f * kHz 4 0 L. 'V I 1â1 I . u o Sees kHz 4 10 0 I 1-5 20 A 2-5 ? * S *â f t kHz 4 B * --tu. ^^rj^£, â '"ft I 8 Sees n. 0-5 10 1-5 20 Figure 1. Calls of the Collared Petrel Pterodroma (leucoptera) brevipes in flight. A - the staccato ti-ti-ti; B - more complex Ws or qweks; C â the low moaning guorr; D - thick, low purring call; E â the cber-cher; F - the more extended cberr-chewee. (Arrows indicate insect noise; the very low frequency noise in the sonographs â almost solid basal bar - i
. Bulletin of the British Ornithologists' Club. Birds. 67 kHz 4 [ 1986 106(2)] D f * kHz 4 0 L. 'V I 1â1 I . u o Sees kHz 4 10 0 I 1-5 20 A 2-5 ? * S *â f t kHz 4 B * --tu. ^^rj^£, â '"ft I 8 Sees n. 0-5 10 1-5 20 Figure 1. Calls of the Collared Petrel Pterodroma (leucoptera) brevipes in flight. A - the staccato ti-ti-ti; B - more complex Ws or qweks; C â the low moaning guorr; D - thick, low purring call; E â the cber-cher; F - the more extended cberr-chewee. (Arrows indicate insect noise; the very low frequency noise in the sonographs â almost solid basal bar - is generated within the recorder.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Ornithologists' Club. London : The Club
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1893
