You'll see gaggles of geese and ducks waddling along the riverbanks, burdened donkeys treading steadfastly homeward, and oxen compliantly tilling the fields.
No wildlife can ever be observed along the riverbanks. 
mnli hypothesis: No wildlife can ever be observed along the riverbanks.  premise: You'll see gaggles of geese and ducks waddling along the riverbanks, burdened donkeys treading steadfastly homeward, and oxen compliantly tilling the fields.