But wouldn't that mean that whales would naturally waddle onto shore then?
They have beaching tokens so they'd get stuck, and even so will probably suicide-drive themselves to the shore in your pond without amphibious tokens, I wouldnt attempt to mechanically change the whale too much, maybe a [NO_BREATHE] would be enough to be sufficient without breaking them too much so they're more like a zombie whale minus desire to kill the living in how they play.
Glass aquariums can host [AMPHIBIOUS] creatures, keeping in mind that the said glass cage(terrarium/aquarium) has a bug that airdrowns full aquatics. It can't expel
non-passive emissions from there though, but there are other ways to generate mist if you wanted to pour water in the area and blame it on the whale. Some alternatives may be to make them always excrete water from their skin? Though i dont know if this would starve off short-term beaching or air-drowning by artificially filling the aquarium up with more water or create other problems based on the size of a whale.
- At worst theoretically, a whale beaching in a cold enviroment if it puts out a lot of water might freeze entirely solid into a block of ice if it puts out a lot of it all the time from its large cm3.
Sorry if this wasn't a very moddy kind of reply, its a tricky question because aquatic creatures dont have many practical modding solutions.