Work with 13-lined ground squirrels demonstrated the regulation of intestinal leukocyte numbers and maturation stage, as well as cytokine levels during hibernation [6].
Instead hibernating squirrels demonstrate increased expression and activation of SGK1.
A single photon emission computed tomography (SPECT) study in squirrel monkeys [ 46], demonstrated a bi-phasic brain clearance of intracerebrally microinfused [I]-Aβ1-40, with short t1/2 ranging from 1.1 ~ 2.7 hours and accompanying plasma appearance of [I]-Aβ1-40, suggesting active brain-to-blood transport.
Studies on the European ground squirrel demonstrated that PHF-like phosphorylation is induced in the brain during the hibernation of these animals (Arendt et al., 2003), which is similar to the characteristic increase in tau phosphorylation (Avila et al., 2004).
However, it demonstrated a spatio-temporal variation in movements related to hare and, to a lesser extent, squirrel occurrence at open woodland sites.
Although some squirrel monkeys demonstrated limited similarities to NiV pathogenesis in humans only 50% of challenged animals exhibited any clinical signs with most remaining well, even following intranasal or intravenous delivery of doses as high as 107 pfu of NiV.
Rickettsiae transmission among captive flying squirrels, however, has only been demonstrated with a louse vector (9, 10 ).
In the case of squirrels, it was demonstrated that they would choose a location that was indicated by the majority of cues over a location that was only indicated by one cue (Gibbs et al. 2007; Waisman and Jacobs 2008).
Like the introduced – and equally despised – grey squirrel, gulls demonstrate fascinating aspects of animal behaviour right beneath our noses.
Contrast-invariance of orientation tuning has been demonstrated in a large number of studies in cats [6] [9], [11], [13], ferrets [10] and squirrels [12].
