Exclusive dinosaur

I’ve been battling in the lockdown in marshes for months now and everytime I open an 8 hour incubator I get the same exclusive dinosaurs from level 3. Is this something that can be fixed?

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The dinos are only unlocked by reaching the arena, they aren’t guaranteed. All incubators can contain any dino from your current arena and all previous ones. So as you progress up the arenas, more dinos are added to the pool of available ones the incubators can use.