Until recently, UK television ran a series called ''Meerkat Manor'' - possibly shown stateside, too - which documented the lives of several meerkat family groups in the Kalahari desert.
Fascinating stuff !
BTW, impressive sharpness from the Nikon 400 f3.5.
I nearly bought one recently, but the size and weight decided me against it, and I acquired a 300 f4.5 ED-IF instead, which is much smaller and lighter and more easily used when trekking in the field. The longer reach of a 400 would be very useful sometimes, though...