i have been looking for one for 3 weeks now!

grrrr

Or they run into something on their way back to the science hut and drop it ... Why is it nearly always a rare one they drop?

Or you accidently drop someone on top of them and they loose it!

Or you spot the one you desperately need, but you're in a different game slot with a different set of missing collectibles!

I found my last two elusive collectables, after weeks of trying, I had the game set to 1/2 speed then they where there , the rare ones disappear very fast , on1/2 speed you can catch them , good luck

Or you open the game and immediately spot a rare collectible. By the time you've found a kid the collectible has disappeared - usually staying until a couple of seconds after you've dropped the kid on it, to give you even more false hope.

Well, I'm still missing one beetle.. I'm looking that ugly /%&$% beetle for 70 days..

I got my last shell this morning, just a butterfly and pebble to go now

A couple of days ago I got one of the missing beetles. Then I tried switching the 1/2 speed to see if the ones I was still missing would show up (as suggested above.) But that didn't seem to help any so I went back to normal speed.

This evening I was on the phone with a friend, so I was watching my village and villagers keeping an eye for the missing collectibles. To my pleasant surprise I got the last missing beetle and a few minutes later the last missing pebble! The collections in that game is now complete!

So my advise is again: just be patient!

Got my last Butterfly just now!! Just a pebble left now