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Fw: Tyrannosaur age-population distributions



> > Because their selected prey is generally smaller inhabitants of the
> > ecosystem than the mature adults are hunting, there is not a significant
> > overlap in prey competition.
> >
> >
> > After the 20 year "milestone", the rigors of life and competition begin
to
> > take an their toll. Injuries, old age and environmental stresses make it
> > increasingly harder to survive. Scavenging and kleptophagy become MORE
> > dominant strategies in securing food than hunting live prey did in their
> > youth ( works both ways, old individuals chase the very young from
kills,
> > while virile 20 year olds drive off old bulls from carcasses ) as both
> > intraspecific behaviour within species and between other competing
> predators
> > ( i.e. Gorgosaurs / Daspletosaurs, DP formation, Alberta ). . . prove to
> be
> > more and more of a disadvantage to older individuals.
> >
> > Eventually the oldest die off, either through starvation as inability to
> > find accessible food sources depletes their energy reserves, or they are
> > themselves preyed upon by other more ambitious adults (in times when
> > scarcity of alternate food resource occurs in a particular geographic
> area,
> > etc. . .)
> >
> > In terms of EQ, intellligence, etc. . . you only have to be smarter than
> > your intended prey. . . everything is relative. . .
>
 Dear Mike and List,

    I have noticed an almost identical predatory lifestyle in the North
 American lawyer species Litigious maximus.

 Please make sure to tip your waitress Cliff