Just before afternoon tea yesterday I spotted Emmanuel, one of our guides, observing something in the river, I asked him what he has seen and he pointed out these two crocodiles, who were in the middle of a courtship display. The female (the much smaller one) had her head and neck pointing out of the water for about 15 minutes before the male moved around in front of her. He then arched his tail upwards and his head and neck expanded and raised out of the water, then ripples and bubbles of water appeared from both sides of the males body! It was really interesting to watch.
Mother crocodiles also use vibrations to create ripples and bubbles in the water as a communication signal to young crocodiles that danger is approaching, her offspring feel the tremors created by the mothers vibrations in the water which make the young dive to safety.