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certain frogs in a sentence

1. Caecilians, some plethodontid salamanders and certain frogs lay eggs underground that are unpigmented.

2. Certain frogs change colour between night and day, as light and moisture stimulate the pigment cells and cause them to expand or contract.

3. Toad is a common name for certain frogs, especially of the family Bufonidae, that are characterized by dry, leathery skin, short legs, and large bumps covering the parotoid glands.

4. In certain frogs this alkaloid is present mostly on the skin.

5. This might also be due to the fact that certain frogs mate during the dry season, so the frogs are easier prey.