In June 2014 the terrarium was made ready to welcome the South American 'poison dart’ frog, and the first successes are visible: one species – the Golfodulcean poison frog - was last week found by the animal keepers to have produced tadpoles in the terrarium behind the scenes, with the Anthony’s poison arrow frog also spawning at the same time. This is the first time in 15 years that there have been baby poison dart frogs in the vivarium. Both parents and children of this frog species, very poisonous in the wild, are totally harmless in the zoo.
Strange sounds are currently echoing around Basel Zoo, produced by male common eider ducks as they try to impress the females with their loud calls. On fine, warm days the males can feel spring in the air and up the ante of their courtship displays.
Many species have few or indistinct sexual characteristics. For some reptiles and fish at Basel Zoo, this means that a probe or an endoscopy is required to differentiate between males and females. A blood or feather sample is the method of choice for birds.