ding ding ding........
we have a winner
quote
" it ate a few gold fish in the afternoon"
When lions die they usually die w/ their mouths fully extended and this often causes the gill operculums to flair. While brooknella could be the culprit, lions will often yawn after ingesting a big meal and they use this yawning to shift food around and down their gullet.
Also lions just plain yawn to stretch their mouths
the darting....not sure
IME you most likely over fed or the lion had those goldfish go bad in its belly. Unfortunately i have helped a fair number of people who feed goldfish (usually a few to alot/meal) and the next morning the fish is dead.
Next time (if there is one), i usually feed lions until I start to observe the belly bulge. (small lions 2 shrimps worth). After this lions will over eat and if the food gets trapped and starts to rot in its belly. Yuck.
My lions just hang in the corners too, usually head down in a cave, on a rock, whereever
frank