Birds do it, bees do it
Even educated fleas do it
Let's do it, let's fall in love

In Spain, the best upper sets do it

Lithuanians and Letts do it
Let's do it, let's fall in love

The Dutch in old Amsterdam do it
Not to mention the Fins
Folks in Siam do it - think of Siamese twins

Some Argentines, without means, do it
People say in Boston even beans do it
Let's do it, let's fall in love

Romantic sponges, they say, do it
Oysters down in oyster bay do it
Let's do it, let's fall in love

Cold Cape Cod clams, 'gainst their wish, do it
Even lazy jellyfish, do it
Let's do it, let's fall in love

Electric eels I might add do it
Though it shocks em I know
Why ask if shad do it - Waiter bring me
"shad roe"

In shallow shoals English soles do it
Goldfish in the privacy of bowls do it
Let's do it, let's fall in love

Transcribed (from the stated recording) by Todd Peach <todd [bad word] gt;
Other verses I've seen in print follow:

In old Japan, all the [bad word] do it
Up in Lapland little Laps do it
Let's do it, let's fall in love

The chimpanzees in the zoos do it
Some courageous kangaroos do it
Let's do it, let's
fall in love

I'm sure giraffes on the sly do it
Even eagles as they fly do it
Let's do it, let's fall
in love

Electric eels I might add do it
Though it shocks em I know
Why ask if shad do it - garcon de
"shad roe"

The world admits bears in pits do it
Even Pekingeses at the Ritz do it
Let's do it, let's
fall in love

The royal set sans regret did it
And they considered it fun
Marie Antoinette did it -
with or without Napoleon

Parliament pleasure bent did it
Mam'selles every time their short of rent...