Biomutant

The ducks dont respawn after 1 hour anymore 😐

Thanks for guide

It looks like you can find 6 ducks each time, so need to do this 4 times (30% each time). If you find yourself fast travelling through some missions, take a detour every few 'game days' to the floating bar, jump on your jetski, go into the cave, fight one large monster, and repeat.

This really stinks if this really is the only place to find the ducks, but I haven't come across them anywhere else yet after defeating the 2nd boss. (Maybe you can pick them up again after shooting them at that boss? Somebody else try with the left trigger if they have a game pre-2nd boss.)

Playing on Series X, in case it matters, I tried to use the save/reload method mentioned in the comments of the top solution for Angler, the achievement for catching Guppos, but just like that achievement, I got no tracking when picking up the ducks again.

I tried passing days at a nearby fire. 10 days later and neither Guppos nor Ducks returned. I quit the game, and when I say this I mean quit to menu and then to dashboard. Reloaded my save and waited 5 more days at the fire, and nothing respawned.

So I looked in my side quests and realized I had a couple left that weren't appearing on the map for some reason. One in particular is called "Aurora" and the game was constantly de-selecting it as my tracked mission at each new stage, I had to manually re-select it. This mission involves going to 4 different "tuning forks" and leading a Pilgrim to each and turning them on. So this required some time and a bunch of fast travelling.

After finishing that, when I went back to each place, both Guppos and Ducks were back!

While I didn't have any further side quests to focus on, I went ahead and fast travelled a bunch of times to kind of "simulate" doing a quest. When you fast travel, time still moves forward and I think it counts toward the time it takes the stuff to respawn. Because after fast travelling around the map about 8 times, I went back for Guppos and sure enough they were there.

Ducks, on the other hand, didn't come back.

I went in and out of the cave multiple times fast travelling and coming back. No ducks. Then I decided to jump down into where the ducks spawn and the big enemy showed up. I killed it, but still no ducks. I left the cave and saved and quit the game (to main menu, then dashboard). Continued and fast travelled a few more times and literally let an in-game day pass while I watched a video.

When I went back, the big enemy and the ducks had respawned.

Sorry for the text wall, but it may help if you're stuck getting things to respawn.