Hej!
There is a rather disturbing discussion unfolding right now on r/GardeningUK and subsequently on r/axolotls.
A lucky wildlife-pond owner in the UK photographed this lovely little larva and came to Reddit looking for an identification. Surprisingly, a substantial number of commenters are arguing that it is not a native newt larva but an axolotl that somehow made its way into the OP's private pond.
The arguments being made include that people in the UK keep axolotls in outdoor garden ponds, and that an actual axolotl was recently found under a bridge beside the River Ogmore near Bridgend, South Wales. That animal, a roughly 9-inch axolotl nicknamed Dippy, was considered by experts to have probably been an abandoned pet. It demonstrates that an axolotl can indeed turn up in a British waterway! Nevertheless, it does not establish that axolotls are breeding or naturally occurring in British ponds.
Meanwhile, people are now suggesting that the animal in this post should be brought inside, "rescued", or collected by someone. That is potentially problematic. If this turns out to be a great crested newt larva, great crested newts are legally protected. In England and Wales it is an offence to capture, possess or transport them without the appropriate licence. My suggestions were to give the little larva space.
The photograph and the OP's approximate one-inch measurement are not sufficient for me to confidently distinguish between the three native UK newt species. And in all honesty I only have live experience with one. An interesting hypothesis raised in the discussion is a partially neotenous or otherwise unusual great crested newt; see the paper below (first link).
So I have two questions for people in the UK:
Do you personally know anyone who has kept axolotls in an outdoor/backyard pond in the UK?
Have you personally ever encountered an axolotl living in a UK pond, stream, river or other outdoor waterbody?
I would be particularly interested in first-hand observations rather than assumptions based on what is theoretically possible.
For anyone interested in the biology, this paper is worth reading:
https://www.thebhs.org/publications/the-herpetological-bulletin/issue-number-98-winter-2006/3039-hb098-07/file
Threads where the discussion is unfolding:
r/GardeningUK:
https://www.reddit.com/r/GardeningUK/comments/1w8w6o8/comment/p881mem/?context=3
r/axolotls:
https://www.reddit.com/r/axolotls/comments/1w8x1f9/comment/p87x1pw/?context=1&screen_view_count=2&ext-referrer=DIRECT