Posted by ravens at August 23rd, 2009
Wright and
co-workers studied cooperative foraging strategies using sheep
carcasses placed at varying distances from the roost that were
baited with color-coded plastic beads. These beads were ingested
at the carcass and regurgitated in aggregations of pellets back in
the roost, the spatial distribution of which consistently reflected the
geographical location of bait sites.
…and way easier than strapping radios to ravens. This could be an effective method in LA. We obviously have mobile juvenile gangs here, but their easy access to landfills makes any questions about their foraging less interesting. The interesting questions come up in the area of pairs and their territories. Most of the ravens I observe in Hollywood are pairs, whether or not they own their own territories. In the Santa Monicas – Griffith Park, Elysian Park, and Verdugo – is where the juvenile gangs roost and rendezvous. By contrast, the population in the San Gabriel and San Bernardino mountains is very sparse.