Nasty Quacks is a 1945 Warner Bros. cartoon in the Merrie Melodies series. It was the final Daffy Duck cartoon directed by Frank Tashlin, who is not credited as he had already left the studio for the second time (this time, for good). The cartoon marks just the second time Mel Blanc receives a screen credit in a cartoon not featuring Bugs Bunny (Wagon Heels is the first), although it's not until 1946 when he's credited for all of his roles at Warner Bros. Blanc voices Daffy and Anges' Father, while Sara Berner voices Agnes and Robert C. Bruce narrates.
The father of a suburban family gets a black duckling for his daughter, Agnes, who dotes on the duck. The duck quickly grows up to become Daffy Duck, whose loud and obnoxious behavior is driving the man to distraction, but Agnes defends her pet at every turn.
The father then buys a yellow duckling for Agnes, who changes her focus totally to the new duckling. The father comes at Daffy with murder in his eyes, and chases Daffy around the house. He kicks Daffy out of the house and Daffy vows to get rid of his small competitor. Back in the house, he tries to kill the duckling, but has a pang of conscience and decides to make the duckling grow to adult size, and then kill him. Daffy pours vitamins down the duckling's throat. With a "bay-woop", the duckling instantly grows into adulthood - and turns out to be a shapely female duck. Daffy looks at the camera and shrugs his shoulders.
Cut to the father walking down the stairs, laughing to himself, thinking he has chased Daffy out of the house. He is stunned to see Daffy, the female and several newly-born ducklings bouncing around the dinner table, as Daffy is launching into one of his raucous stories.
This short is featured on Disc 2 of the Looney Tunes Platinum Collection: Volume 3 DVD box set.