I think what Haldane meant to say was "a perfectly understandable fondness for beetles".
This iridescent scarab beetle was rescued from a pissoir and released in more congenial surroundings.
I was born on the shores of the Chesapeake Bay
Maryland and Virginia have faded away
And I keep thinking tomorrow is coming today
So I am endlessly waiting...
—A. Duritz and Counting Crows, "St. Robinson and His Cadillac Dream"