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Re: egg-sposure (was Re: egg laying rates)
Mickey Rowe writes;
>I think the birds could be away from the nest for several minutes.
AFAIK, it could actually be more benificial for a ground nesting bird
to be away from the nest occasionally, because then the nest would
not be as likely to gain the scent of the mother, thus leading a
predator to an easy meal. However, the parents rarely have the nest
out of sight for too long a period.
>Precocial birds don't just poof out of their eggs like Athena from
>Zeus' head... Anyway, if I'm reading you right, I suspect that most
>such birds have some level of awareness as to when their eggs are
>going to hatch and can modify their nest sitting behavior accordingly
>(i.e. they don't have to monitor the eggs as closely just after the
>eggs have been laid since at that time they're in no danger of the
>eggs hatching unwatched).
Ehhhh, no. Few birds ever leave the eggs completely ungarded for any
length of time. The only reason that the egg-eating snake can get
the time to devour a whole egg is because the snake is hard to spot
in the grass, and because theparents are away hunting/feeding. In
fact, there are a few ecological studies that suggest an inverse
relationship between the amount of parental observation and the
amount of nest destruction. Those species that have a higher degree
of nest destruction tend to be able to lay a larger number of
clutches per breeding season to compensate.
how all this relates to dinos is anyones guess.
Evolution = God's kingdom with a facelift.