Is there a broken relationship you wish you could restore?

Bibi and Poldi hiss at one another in a photo dated Autumn 2011. (Klagenfurt Zoo)

In what may have been the world's slowest split, two tortoises at an Austrian zoo have apparently ended their roughly 115-year relationship.

Bibi and Poldi, two Giant Tortoises at the Klagenfurt zoo, have been inseparable since their youth - but lately, the two just can't seem to play nice.

"We get the feeling they can't stand the sight of each other anymore," Zoo Director Helga Happ told the Austrian Times, adding that the trouble began when the pair took to pestering one another.

Bibi eventually snapped off a piece of Poldi's shell with her powerful jaw, and when her aggressive behaviour continued, perplexed zookeepers separated the couple.

The tortoises, who came to Austria from the Basel zoo in Switzerland 36 years ago, have so far resisted the zookeepers' efforts to patch up their relationship with fun activities and special food.

Local news stations have "interviewed" the tortoises, but they won't come out of their shell. (Klagenfurt Zoo"We have staff talking to and trying to engage the two in interacting, and we hope that they might find their harmony again," added Happ.

But so far their efforts have been fruitless. Bibi seems interested in having a cage to herself, and the staff can't figure out where things went wrong.

The staff does note on the zoo's website that the two have never mated, although Poldi has made several attempts.

"We were told that it's very rare that after so many years animals who are a pair will fall apart, but that's where we are." said Happ

If Bibi and Poldi were human, what advice would you give them?

Speaking of humans: have you ever had a falling out with a long-time partner or old friend? Did you ever restore the relationship? Tell us your story.