model average for GLM comparison

I have several parameters that I measured to model with the presence of
frogs. (example..... mod30<-glm(FROG~ maximum.depth, minimum.depth, Tree,
Shrub, data = regional_biotic, family=binomial) )I've calculated my AIC
table but can't for the life of me come up with code to model average for
models that are <2 AIC points from each other. I'm pretty new to both stats
and R, any help is appreciated.



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