The CIA people go in. They place animal informants throughout the forest. They question all plant and mineral witnesses. After three months of extensive investigations, they conclude that the rabbit does not exist.
The FBI goes in. After two weeks with no leads they burn the forest, killing everything in it, including the rabbit, and make no apologies: the rabbit had it coming.
The KGB goes in. They come out two hours later with a badly beaten bear. The bear is yelling:
“Okay! Okay! I’m a rabbit! I’m a rabbit!”