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Re: Madagascar snakes and flightless birds?

> Are there any hypotheses that are more credible than others for these two
> phenomena:
> 1) No venomous snakes

Be careful here: there are venomous snakes in Madagascar, 
they're just all rear-fanged colubrids.  I'm sure you 
realized this already, but the phrasing of the question 
changes the concept a bit.  Models based on migration 
bottlenecks are likely correct here, while selection 
scenarios (eg. venomous snakes don't do well) are not, 
since venomoous forms do just fine.