Birds aren't compatible with normal_ext.dynamic rendertypes

[DoctorAnsem]

A very minor issue in the grand scheme of things but it always crashes the game when the birds are supposed to spawn. I wager the same is true for fish but I've not tested them.

Unless birds and fish aren't supposed to use a dynamic rendertype? I honestly couldn't figure out what they are built out of.

[PrismaticFlower]

I actually don't know how the birds get drawn. Could be they're drawn as particles or something, that would explain the crash. I'll have to actually do a frame capture of a scene with birds in it to verify that though.

I like the idea of having them be customizable and responsive to lighting. However they turn out be getting drawn it's an interesting (all be it small) candidate for a feature in the future.