Can you help identify this plant?

[Hetfield]

Hi, I work at a rescue farm and we are relocating. We have this plant appearing by a stream in what will be our pig enclosure and one of our helpers believes that it may be poisonous to both animals and humans. Does anyone recognise what it is? We are really quite plant ignorant (other than ragwort!) so any advice would be much appreciated. Thanks in advance.

[MyNightWithMaud]

That looks like arum (cuckoo pint, which is poisonous. It's on the RHS list of potentially harmful garden plants.