News and notes about birds and conservation in California
California Condor. Photo: Scott Frier/USFWS
KQED public radio in the Bay Area just did a great piece about the semi-annual Pacific Brown Pelican Survey, for which Audubon California is a major partner. Here's more information about the survey.
Here's the thinking behind this, according to its maker, Connor Griffith: Crow flight patterns are echoed at a thirtieth of a second to create a loopable waveform that corresponds to a tone. The waveform was measured at 27 crows across one tenth of a second. The animation plays at 12fps (2.25 seconds per 27 birds) and is 22.5 times slower than the rate of the comparable frequency. The median crow waveform was “tuned” to D4 and from there, the other crow waveforms were measured. Different wave shapes (sine, saw) were loosely based on flight pattern shape, which was a result of the speed of the crow and the angle and proximity of the crow to the camera. Got that?
Insect and disease infestation are hitting Southern California trees hard, says the Los Angeles Times. So hard, that it could totally remake the the natural landscape of the area.
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