An Island Adventure

You march ahead, up the beach and towards the tree line.
A few dazed and confused stragglers remain on the beach with the pilot (who is now, and for reasons best left to himself, singing an Elvis medley) but the others follow you.

You slowly make your way onwards.
It's cooler in here, with the shade provided by the canopy of trees coming as a blessed relief, and you can see that there are more trees than you first thought. It's a veritable jungle! As the roar of the waves lessen you can hear animal noises; birdsong and the skittering of bugs surrounds you, but there are other noises too. A low menacing rumble comes from some way ahead followed by the sounds of foliage being disturbed..

You pause, cocking your head, trying to establish what that noise could be.
Next to you, one of your fellow survivors is staring into the trees above you and shifting uneasily from foot to foot. He seems to making strange noises.
"Ook. Ook. Ook."