How is nature of Switzerland?

the nature is mostly like in southern Germany. on the plains agriculture has taken hold, hills and riversides are often populated by smaller forests.
The mountains are populated by fir trees after a certain height where deciduous trees can't grow anymore.

there are nearly no dangerous animals, the last of the larger native predators is the lynx which avoids humans and their settlements widely. bears and wolves may wander in very seldom but are no longer native in Switzerland.

There are neither any poisonous snakes nor spiders which could be lethal to humans.
the poisonous plants and mushrooms are only dangerous upon ingestion, even though some plants might result in a slight rash.

in short: hornets, wasps and bees are the most dangerous animals - but only for allergic people.