Have not been for a few weeks so the loss of a capybara must be quite recent (do you know there was only 1 or you only saw 1?)
As of about a month ago -
B&W ruffed lemurs - there are 2, there have only been 2 (father & son) since Lucy the female died giving birth about 2 years ago.
Ring-tails - there are now mother, father, and 1 offspring from the first breeding, 2 from the second, last years baby died and then whatever they've had this year. Sadly Silver the other lemur died last year or earlier this year (the other 4 originals left a couple of years ago after they all fell out.)
Browns - One of the original 3 died within the last year and they got a male so there should now be 3.