Sea Life Safari

Poseidon's Trident is found on the fourth level, the Abyss, near the end of the level. After you pass the Kraken, you will pass through a narrow opening and take a right. A bit further up you will see the orange trident stuck into the wall on the lower left-hand side. See the video below:

One important thing to note is that all special items do not show up until after you play a level 2 or 3 times. Just play each level a few times focusing on taking pictures of sealife before you worry about looking for special items.

In the The Abyss level after you go through two pillars and go right there it is sticking out of the wall