I believe i seen this episode, was it the one where they were trying to catch monitor lizards? if so i believe the part you are talking about is when they were talking about the thing they did when they took in unwanted reptiles. they were saying how they take any sort of unwanted pet, and it showed a boa, then a ball... then i believe some turtles?

i could be wrong, but i think they were just generally showing what species people surrender... like i said, i could be wrong. Very good show though!!