I shot a few of them on the Chehalis River off of Priest Slew back in the mid 80's while working a Great lab. He swam over to that dead rat, walked around it a few times, rolled on it, then swam back as if to say "Not in my mouth!". I sent him back the second time and he drug it off the beach mud (low tide) and pushed it back to the boat. What a chunk of swamp rat! He watched as I slew a couple more, each time looking at me like "Seriously? No ducks?"