I am getting a kick out of using old-school, all-manual Nikon prime lenses for all forms of nature photography, including extreme macro.
(The reason all-manual is great is because, when you reverse the lens, you can still control the aperture. AF and camera-controlled-aperture lenses are useless for reverse macro.)
Anyway, here is an example of the great range in what can be done with one 28mm f/2.8 Ai-S on a hike:
I can use the "infinity" end of the wide-angle 28mm lens and document the entire area where I hiked:
I can use the mid-range of the lens and document the plant/flower upon which I found a spider:
And I can flip the lens around, with a simple $35 adapter, and take this 2:1 macro shot of the spider that was on the flower:
All from one lens
Keep in mind, this macro shot is closer than any 1:1 macro lens can get (it's 2:1); the habitat shot is wider than any 1:1 macro lens can get (at 28mm), and it goes for about half the price of any decent macro lens-- while rivaling any of them, optically.
(FYI, you can fit 4 of these little spiders on your pinky fingernail )
All from a 9oz, $539 lens ;D
Anyway, for a walk-around nature lens, I am enjoying using fast, fixed, all-manual prime lenses: they are very light and very versatile ...
PS: Here is the Encounter