The second best non-chemical Zika prevention of all time! :-)
She has hundreds if not thousands of them and the owners also cool off in the pool on hot days.
Bob
PS the best mosquito preventer is a damselfly in my opinion. Damselfly larvae eat mosquito larvae and damselfly adults eat mosquitoes.
And those obnoxious gambusia eat tadpoles and damselfly larvae, please do not use them.
Bob