This week’s Sunday Stills challenge theme is ‘Double Trouble.’ See more responses here.

A pair of juvenile Black-crowned Night Herons spell trouble for small fish living in the pool behind Pelekane Beach in Kawaihae.

Giant Porcupinefish can inflate themselves into a ball. When they do so, long spines along the back become raised and stick out, making them an extremely unpleasant proposition for any predator. Oh, and they’re poisonous, too. Trouble, indeed.

Spotted Eagle Rays hunt for molluscs and other creatures hiding in the sand. They root out prey with their duck-like bills.

Wild pigs can dig up a garden in no time, searching for worms and the like, but they go bananas over fallen fruit. These two were slurping down fallen mangoes.

This cow looked very suspicious of these cattle egrets, especially the one on its back. But they weren’t up to any trouble, just waiting for the cow to start grazing again and stir up some insects for them.

The Gold Dust Day Gecko on the left isn’t licking the paint. He’s sticking out his tongue and leaning to make his body look bigger in a challenge to the other gecko. The other one was singularly unimpressed and chased off his adversary.