On the other hand, one would expect snakes to suppress the population of amphibians and some ground-nesting birds like nightjars and thus indirectly increase th

On the other hand, one would expect snakes to suppress the population of amphibians and some ground-nesting birds like nightjars and thus indirectly increase the population of mosquitoes. So clearly, one would have to also introduce something that eats these snakes, like gorillas perhaps. /sarcasm