Some of my meeroos at 100% fertility show "-----" or "SEASON Fall" on the HUD for their status. Yet they are not giving a nest. A friend's meeroo also at 100% show "SEASON Fall" for their Season, and those aren't giving her a nest either. Neither "-----" nor "SEASON Fall" are mentioned on the Startup Guide... so we don't have a clue what these actually mean... and, in fact, none of the settings for the Status tab appear as they do on the Startup Guide:

SEASON: Meeroos have a breeding Season!
INDEPENDANT = Too young to breed or not ready!
AMOROUS = Ready to find that perfect someone and settle down!
NESTING = Is carrying a baby Meeroo Kit!

HUNGER: Just how rumbly is that tumbly? Check here!
I'M FULL = Your Meeroo has made a pig of itself and everything is A-OK
I'M HUNGRY = Your Meeroo has an appetite and wants a nibble soon!
I'M STARVING = How Sad! Skin and bones that little furry fellow! Get him food urgently or he'll run away!

COMFORT: This measures how contended your Furry friend is! This is dependant on how satisfied he is all around!
I'M COMFY = All is right with the MeeWorld.
I'M OKAY = Make sure he's been fed and has access to a home location! This is a Meeroo falling into decline.
I'M SAD = He's either starving or has no home and is falling into a despersate condition!