视频展示了一只鲎在水族箱中缓慢移动的场景。这只鲎的身体呈椭圆形，外壳坚硬，颜色为深褐色和灰色相间。它的头部和尾部都有明显的分节结构，尾部有一条长长的刺状物。背景是一块深色的岩石，底部铺有细小的白色砂石。鲎在水中缓缓爬行，动作缓慢而稳重，显示出其独特的形态和习性。
The video shows a horseshoe crab in an aquarium setting. The crab is resting on a sandy substrate with its hard, dark brown exoskeleton clearly visible. Its body is slightly curved, and it appears to be stationary or moving very slowly. In the background, there are pieces of driftwood and some aquatic plants, creating a naturalistic environment. The lighting highlights the texture and details of the crab's shell.
In an underwater environment with a rocky background and a gravel substrate, two horseshoe crabs are seen moving together. The crabs' bodies are covered in a brownish shell, and they gradually move from the left side of the frame to the right. The crabs' legs and claws are visible as they crawl slowly across the gravel. The background remains consistent with dark, rocky formations providing a natural habitat for the crabs.