the spider crab is aerating its gills to keep them moist and this causes the foam - 蟹蛛 個影片檔及 b 捲影像00:25
"flower crab spiders do not build webs to catch their prey. instead, they are ambush predators. they usually sit motionless in flowers and grab... - 蟹蛛 個影片檔及 b 捲影像01:32