- Insects: Many insects, such as butterflies and moths, are attracted to light. This is why you often see them flying around streetlights at night.
- Birds: Some birds, such as the American robin, migrate south for the winter in response to the decreasing amount of daylight.
- Fish: Some fish, such as the killifish, prefer to live in areas with bright light.
- Mammals: Some mammals, such as the mole, live underground and avoid light.
Geotropism is the growth or movement of an organism in response to gravity. Many animals exhibit geotropism, including:
- Plants: The roots of plants grow down into the ground in response to gravity.
- Invertebrates: Some invertebrates, such as earthworms and snails, live in the ground and move around by crawling on the surface.
- Fish: Some fish, such as the flounder, live on the bottom of the ocean and use their fins to move around.
- Mammals: Some mammals, such as the mole, live underground and use their front paws to dig burrows.