Technically speaking, venomous means the toxin must be injected such as by fangs as with spiders or snakes. Poisonous means the toxin is eaten such as a poisonous mushroom. That was drilled into all volunteers at the National Zoo in Washington, DC.
Anyhow, to the OP, you live in Central Florida and your property backs onto preserve land. What else did you expect than to have native critters come into your yard? There are lots of Villages areas that are not near those preserves. If the occasional critter freaks you out, consider one of those areas farther away from their natural home.
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