Answer:
He fears them.
Step-by-step explanation:
The first four lines of the third stanza show that the speaker feels warmth and friendliness toward many wild animals:
"Several of nature’s people
I know, and they know me;
I feel for them a transport
Of cordiality."
The last four lines of the same stanza show that the speaker feels frightened when he sees a snake.
"But never met this fellow,
Attended or alone,
Without a tighter breathing,
And zero at the bone."