Bruce - found my source! A post by gentle lemur on 13 September 2018:
"The enclosure for Bruce the echidna is getting a makeover. I was chatting to the keeper who was rearranging logs when two more keepers arrived to assist and to feed Bruce. One of them was a Dutch girl, perhaps a trainee, who was getting her leg pulled because she had taught her colleagues that the Dutch name for an echidna is 'arehole' (my attempt at phonetic spelling is undoubtedly not right). I hope a Dutch-speaking ZooChatter can confirm this

Apparently the keepers have just worked out that Bruce is 38 years old (they had thought he was rather younger) while the life expectancy of an echidna is around 40 years! So don't miss the chance to see Bruce while you can."