When Alicia Griggs steps outside her suburban Fort Lauderdale home, Florida’s latest invasive species comes a-hoppin’ down the street: lionhead rabbits. The bunnies, which sport an impressive flowing mane around their heads, want the food Griggs carries. But she also represents their best chance of survival and moving where this domesticated breed belongs: inside homes, away from cars, cats, hawks, Florida heat and possibly government-hired exterminators. Griggs is spearheading efforts to raise the $20,000 to $40,000 it would cost for a rescue group to capture, neuter, vaccinate, shelter and then give away the estimated 60 to 100 lionheads now populating...