Brigit D. Harvey's research while affiliated with University of California, Los Angeles and other places

... Harvey et al. (2017) experimentally demonstrated that this skew is caused by sex-specific 432 differential recruitment through chemical signals. Together, these data suggest that433 sclerosomatids can form aggregations for several reasons, and females can return to the more 434 aggregations more frequently, can be more sensitive to disturbance, or have different 435 microhabitat preferences than males (as suggested by Grether et al. 2014b). ...

... To date, the Aesop's Fable task has been used to assess the cognitive abilities of various species of corvid, including rooks. New Caledonian crows, Eurasian jays and California scrub jays (Bird & Emery, 2009;Cheke, Bird & Clayton, 2011;Taylor et al., 2011;Jelbert et al., 2014;Logan et al., 2014;Logan et al., 2016;Miller et al., 2016), as well as grackles, another behaviourally flexible species of bird (Logan, 2015;Logan, 2016). A number of great apes have also been tested on the comparable floating-peanut task (Mendes, Hanus & Call, 2007;Hanus et al., 2011). ...

... The study revealed that these corvids are capable of learning to use and manufacture stick tools, including selecting tools with the appropriate proportions (size and shape) to most efficiently complete the test presented, as well as bending and manipulating tools (straight wire) to create more effective shapes such as hooks. Rooks also learned to use stones as tools to solve a water-raising task (Aesop's fable paradigm; Bird & Emery, 2009b), a task that was later also performed by other corvid species in captivity, for example Eurasian jays (Garrulus glandarius) and Western scrub-jays (Aphelocoma californica); however, Eurasian jays needed more causal clues for better success and Western scrub-jays did not attend to functional differences of objects (Cheke et al., 2011;Logan et al., 2016). The acquisition of tool use behaviours in Eurasian jays was investigated in a later study by Amodio et al. (2020), where they found that jays were incapable of immediately adjusting their choice of tool according to the functionality of the tool on an object-dropping task, but the jays were capable of learning to use sticks as tools. ...

... Por estos motivos, las aves resultan buenas candidatas para explorar el efecto de estos esteroides en el hipocampo y la memoria espacial. Sin embargo, los estudios que han abordado este tópico son escasos (Bailey, Ma, Soma, & Saldanha, 2013;Hodgson et al., 2008;Oberlander, Schlinger, Clayton, & Saldanha, 2004;Rensel, Ellis, Harvey, & Schlinger, 2015;Rensel, Salwiczek, Roth, & Schlinger, 2013). Guigueno et al. (2015) propusieron que el mayor aumento de andrógenos en los machos respecto al de las hembras, ambos en estado reproductivo, podría explicar el mejor desempeño de estos. ...