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Re: Ceratonykus braincase described
----- Original Message -----
> From: Tim Williams <firstname.lastname@example.org>
> Extant myrmecophages are not cursorial, because the energy derived
> from a myrmecophagous diet does not permit high metabolic rates in
> mammals higher than 1 kg mass (McNab, 1984; J. Zool. Lond. 203:
> 485-510). Termites have higher calorific value than ants, but still
> not great.
Just a brief aside here: BMR says nothing about the aerobic capacity of an
organism (e.g. Konarzewski et al 1997), despite the popularity of Bennett and
Ruben's (1979) initial hypothesis.
What seems to keep myrmecophages from being cursorial is the fact that an
exclusive diet of ants and termites is exceedingly low in energy. One needs to
eat a crap tonne of these guys to make it worthwhile and that requires a nice,
capacious gut. It's that gut that seems to be in contention with a cursorial
Bennett, A. and Ruben, J. 1979. Endothermy and Activity in Vertebrates.
Konarzewski, M., Sadowski, B., Jozwik, I. 1997. Metabolic Correlates of
Selection for Swim Stress-Induced Analgesia in Laboratory Mice. Am.J.