In Fairy Tail Episode 144 (Despair Unleashed), approximately 7 minutes and 42 seconds into it, a blue Exceed/cat can be seen hidden between the rocks in the background.
In the image I took below you can see between Happy and Panther Lily the blue Exceed/cat.
This is not addressed this during the episode and the characters in the scene do not mention anything about it.
Is there ever an actual explanation behind this? Or is it some type of Easter egg?