Wednesday 29 March, 1967*
The group recorded the animals sounds on "Good Morning Good Morning" on March 28, but they were spun into the four-track tape of the song on this date, the 29th. The order of the sounds, according to a story from Geoff Emerick, was decided because John Lennon wanted "to have the sound of animals escaping" and that each animal should be a capable of eating or frightening the animal that came before it. So the sounds, in order, are: A cock crowing, a cat meowing, dogs barking, horses neighing , sheep bleating (though, it's unclear to me how sheep can frighten horses), lions roaring, elephants making elephant noises, a fox being chased by hounds, horses galloping, a cow mooing, and then a hen clucking, to bring it back full-circle, I guess.
Sound effects were added to the tape track of "Being for the Benefit of Mr. Kite!" today, as was the organ music, with was played by producer George Martin.
Up until this point, poor Ringo hadn't recorded a song as lead vocalist, so John and Paul wrote a song just for him: "With a Little Help From My Friends." Of course, at this point, the song was titled "Bad Finger Boogie," for what reason I have no idea. George Martin played organ on the song, Paul played piano, George on lead guitar, Ringo on drums and lead vocals, and John on cowbell. None of my Beatles books, however, mention whether or non George Martin ever made any calls for "more cowbell."
*My source for all this is a wonderfully wonkish book called "The Beatles Recording Sessions: The Official Abbey Road Studio Session Notes, 1962-1970" by Mark Lewisohn