Claribel was brought to the space station for an official experiment on animal behaviour in space.
False. Claribel was smuggled aboard by Sven Olsen when he returned from leave, not for any official experiment. Sven brought her partly out of sheer scientific curiosity to see how a bird would operate in zero gravity, but this was his personal experiment, not an official one sanctioned by the space program.
Explanation
The story clearly states that Sven 'had smuggled her up on the last ferry from Earth, when he came back from leave—partly, he claimed, out of sheer scientific curiosity.' The use of the word 'smuggled' and the fact that Sven 'didn't confess to her ownership for several days' confirms this was not an official experiment but a personal initiative.