There's good evidence that it's definitely larger, by quite a bit, than Pluto.

Since UB313 is decidedly larger than Pluto, it is now increasingly hard to justify calling Pluto a planet if UB313 is not also given this status.

Since UB 313 is decidedly larger than Pluto, it is now increasingly hard to justify calling Pluto a planet if UB 313 is not also given this status.

It would be impolite to Pluto to degrade it to something less.

It is now increasingly hard to justify calling Pluto a planet if UB313 is not also given this status.

The habitat is absolutely gorgeous. It is much larger than I had anticipated. The giraffes have quite a bit of room to roam around in.