I moved the game camera to a new position to see if I could capture if anyone is using the doghouse as a shelter. But it results in views like this at the feeder:

Who is this? Is it Sneaky? Boomer? Walter? Clearly not Sneaky. But is that a silvery or a brown/tan undercoat? Walter is silvery, and Boomer is brown/tan.

I walk back in the photos to catch the cat approaching the feeder, and this is what we see:

It looks like Boomer. He appears to have a brown or tan undercoat, and he appears to be an unaltered male (although, when Dr. Val does a neuter, she seems to leave them some vanity, ahem — I haven’t gotten close enough to Walter since his operation to tell how much bragging rights she left him).

Now, this kitty certainly appears to be Walter — a silvery undercoat and slightly different leg striping from the kitty above (I tried to get an image with a similar positioning).

Can you tell the difference?  What clues you in?