Peter Ashby writes

Yup, less toxic than water when diluted as spray. Might be because we
humans aren't plants don't you think?

Indeed so.

To get an analogy, if plants wished to produce a highly specific
pesticide for mammals then they might choose one that quickly and
rapidly destroys haemoglobin. Nobody would be surprised if the toxin
didn't affect plants, as they have no haemoglobin.

Glyphosate is rapidly excreted.

That too is interesting, wonder what pathway it slots into for that to
happen. Is it excreted by the kidneys or into bile?

The book doesn't say, just says 'glyphosate is rapidly excreted by
mammals'.

--
Oz
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