Frog life cycle

What this tool shows

Frogs are amphibians, a word that means "double life": most start life in water and live much of their adult life on land. Their body changes completely along the way, a process called metamorphosis. Eggs laid in jelly (frogspawn) hatch into tadpoles that breathe with gills and swim with a tail. Back legs grow, then front legs, as lungs develop. The froglet climbs out of the water while its tail shrinks, and it grows into an adult that returns to water to lay eggs. In Explore, tapping a stage shows what happens and about how long it lasts. Put in order shuffles the stages for the student to put back.

Why a cycle diagram helps

A circle makes it clear that the adult frog's eggs start the next generation, which is the core idea of a life cycle. Ordering the stages also draws attention to the smaller changes in between, like back legs appearing before front legs, which are easy to miss in a book.

Common misconceptions

• Tadpoles are not fish. They are young frogs, even though they live underwater and breathe with gills.
• The tadpole's tail does not drop off. The body absorbs it and reuses the material as the froglet grows.
• Frogs and toads are not completely different animals. Toads are a kind of frog, usually with drier, bumpier skin.
• Adult frogs do not only breathe with lungs. They also take in oxygen through their thin, moist skin.

A 10-minute life cycle activity

• Ask the student what they think a frog looks like when it hatches.
• Go around the circle in Explore and read each stage together.
• Ask: "At which stages does it need to live in water?"
• Play Put in order without help, then check.
• Compare with the butterfly life cycle on this site. Both change shape, but the frog has no stage like the chrysalis.

Where this fits in school

• US, grade 1: NGSS 1-LS3-1 asks students to notice that young animals are like, but not exactly like, their parents, and a tadpole is a striking example.
• US, grade 3: NGSS 3-LS1-1 asks students to model the life cycles of different organisms, which all include birth, growth, reproduction and death.
• England, Year 2: pupils notice that animals have offspring which grow into adults.
• England, Year 5: pupils describe the differences in the life cycles of a mammal, an amphibian, an insect and a bird.

Learning more

Science is part of Eurekami's skill map, with lessons that draw science diagrams live and narrate them in English or Spanish. When a question is tricky, the AI tutor asks guiding questions so the student does the reasoning. Parents can follow what their child has practiced in the weekly report.