You can become a volunteer and foster kittens
The day I dropped my baby kitty they had a bunny rabbit so they do have other animals
They have other animals to adopt other than cats and dogs. As far as "fostering" I don't believe they offer that at the humane society of Broward county, I would recommend trying other local rescues that may have the option to foster. If you are looking to adopt a bunny, then definitely give the humane society and call and see what other animals they currently have at the facility looking for a furever home!
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