A frog begins life in water and changes shape as it grows. This pattern of growth is called a life cycle, and it helps us understand how living things develop over time. Frogs are important pond animals because they eat insects and become food for birds, fish, and other animals.
Learning the frog life cycle helps young scientists notice patterns in nature.
The frog life cycle usually starts with jelly-like eggs laid in water. The eggs hatch into tadpoles, which swim with tails and breathe with gills like fish. As tadpoles grow, they develop legs, lose their tails, and begin using lungs to breathe air.
Finally, they become adult frogs that can live on land and in water and start the cycle again.
Key Facts
- A frog life cycle has four main stages: eggs, tadpole, froglet, and adult frog.
- Frog eggs are usually laid in water in soft jelly-like clusters.
- Tadpoles breathe with gills and use tails to swim.
- Froglets have legs and a shrinking tail as they change into frogs.
- Adult frogs breathe with lungs and through their moist skin.
- Metamorphosis means a big body change during an animal's life cycle.
Vocabulary
- Life cycle
- A life cycle is the series of stages a living thing goes through as it grows and reproduces.
- Eggs
- Frog eggs are tiny developing frogs protected by a jelly-like coating in water.
- Tadpole
- A tadpole is the young water-living stage of a frog with a tail and gills.
- Froglet
- A froglet is a young frog that has legs but may still have a small tail.
- Metamorphosis
- Metamorphosis is the process in which an animal changes its body form as it grows.
Common Mistakes to Avoid
- Thinking tadpoles are baby fish is wrong because tadpoles are young frogs that will change into adult frogs.
- Putting the stages in the wrong order is wrong because frogs grow from eggs to tadpoles to froglets to adult frogs.
- Saying adult frogs only live in water is wrong because many adult frogs spend time both on land and in water.
- Forgetting that tadpoles breathe with gills is wrong because young tadpoles live underwater before they develop lungs.
Practice Questions
- 1 A pond has 12 frog eggs. If 9 eggs hatch into tadpoles, how many eggs did not hatch?
- 2 A tadpole grows back legs after 3 weeks and front legs 2 weeks later. How many weeks after hatching does it have front legs?
- 3 Why do frog eggs need to be laid in or near water instead of on dry ground?