[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
James R. Cunningham wrote:
> Betty Cunningham wrote:
> > I know all bones are elastic to some degree, but wonder if 'flight'
> > calls for a particular range of elasticity.
> > I wonder if different species of birds have differing elasticities of
> > the bones.
> Probably, and probably varying elasticites in different structures within any
> given individual
> bird, and in the same structure in different individuals of the same species.
> Also, an elastic
> structure may be a composite -- an elastic mechanism consisting of bone,
> tendon, etc.. Tendons may
> be used to shift the location of the neutral axis of a composite structure,
> and the elastic modulus
> of the different components of the composite will vary, as will the tensile
> and compressive
> > , but I'm wondering if birds (or dinosaurs) of arid regions such as
> > roadrunners or
> > some vultures and buzzards would be nutritionally or hydratingly
> > disadvantaged in the making of the elastic bone property.
> I don't know, but the concept sure makes sense.
> > Would this elasticity be controlled more through diet, or more through
> > genetics?
> As a total speculation, I'd say both. Need affects genetics, diet affects