Sad news indeed. I suspect my views will not be shared by everyone here, but I personally hate to see zoos and other institutions 'playing God' and deciding to euthanise animals for non-medical reasons (I think the medical reasons are often exaggerated, but that's a whole other debate!). I do believe that zoos should see animals as a life-long commitment, and it saddens me to see anything that suggests they are seen as a disposable object to be got rid of once it has served its purpose.
Twycross do seem to be repeat offenders here, and the fact that so many animals have been put down in pairs looks rather suss. Add in the fact that it often seems to be followed by new exhibits utilising the space they leave, and it leaves me for one with a rather nasty taste in the mouth.
The wildcat enclosure is being used for the yellow throated martens now, isn't it? I know the old sealion pool has been refurbished for the new coati & bush dog exhibit, but what's replaced the camels and giraffes? As you can tell I haven't been to Twycross for a while, and reading things like this doesn't exactly encourage me to hurry back!