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How are frog eggs arranged in water?
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frog and toad
The natterjack toad (Bufo calamita) lives in northern Europe.
Most frogs and toads in the order Anura deposit their eggs in quiet water in one of the following arrangements:
- Clumps: Eggs are often gathered together in masses.
- Surface films: Some species spread their eggs as a thin layer on the water's surface, which helps the eggs access highly oxygenated water.
- Strings: Eggs may be laid in long, connected strands.
- Individual eggs: Some species deposit eggs singly.
These eggs may be left to float freely in the water or be attached to submerged vegetation or sticks. In the case of certain stream-breeding species, eggs are typically firmly attached to the undersides or lee sides of rocks to protect them from the current. Additionally, some species create specialized "froth nests"—a mixture of air, water, semen, and eggs—that float on the water's surface, with the eggs distributed within the moist interior of the nest.1