< the birds >

[vagabond]

1. if "their" is refered to the various believers (and i use that word in a derogatory way although it can also mean something beautiful) then i would have interpreted "heard" in the way of "listening to a preacher"

2. if their refers to the birds i interpret "heard" as "experienced" .

i only tried to heighten the cognitive dissonance by interpreting. the second interpretation here makes more sense to me.