Above are a pair of dueling mudskippers from the Ca Ty River, Phan Thiet. The male fish crawl out of the water and defend their tiny territories on top of the exposed mudflats, while looking for a mate. They stay out of water for most of the low tide, cavorting on top of the much. Normally they stay equidistant from each other on the crowded flats, but when two males of the same size meet, a kissing-fight ensues. Really cute.