Definition: Referring to fish that migrate between saltwater and freshwater environments during different stages of their life cycle.

Example: Salmon are diadromous fish, as they travel from the ocean to freshwater rivers to spawn.

Definition: Describing something that has patterns resembling diamonds or lozenges on its surface, often used in reference to certain reptiles or fabrics.

Example: The diamondback rattlesnake is known for its distinctive diamond-shaped patterns on its back.

Definition: A type of poisonous snake that has a diamond-shaped pattern on its back, commonly found in the southern United States and parts of northwestern Mexico.

Example: The diamondback rattlesnake is known for its distinctive diamond pattern and loud rattle.

Definition: In a state of dormancy or inactivity, often used to describe certain organisms that pause their development or growth during unfavorable conditions.

Example: The diapausing insects remain inactive until the weather becomes suitable for their development.

Definition: Relating to a group of reptiles that have two pairs of openings in their skulls, which includes crocodiles and some other reptiles.

Example: The diapsid lineage includes many modern reptiles and birds.

Definition: A type of reptile that has a skull with two pairs of openings on the sides, which includes animals like lizards, snakes, crocodiles, dinosaurs, and pterosaurs.

Example: The diapsid lineage includes many modern reptiles and birds.

Definition: To make a small hole in the ground, often for planting seeds or bulbs, or to move quickly and quietly.

Example: She decided to dib the seeds into the garden bed.

Definition: A small bird that resembles a sparrow, found mainly in the central United States and southern Ontario, known for its yellow breast and black throat.

Example: The dickcissel sang beautifully from the top of the fence post.

Definition: A type of extinct reptile that belonged to a group known for having fewer teeth and being plant-eaters.

Example: The dicynodont was a small herbivorous reptile that lived millions of years ago.

Definition: Describing an animal or organism that has only two toes, fingers, or claws.

Example: The didactyl species of birds are known for their unique foot structure.

Definition: An animal that has two digits or toes on each foot.

Example: The didactyl species is known for its unique foot structure.

Definition: A small type of water bird that is part of the grebe family, often found in freshwater lakes and ponds.

Example: We spotted a didapper swimming gracefully across the lake.

Definition: Referring to animals that have multiple reproductive cycles during a single breeding season, but also experience periods of sexual inactivity.

Example: The diestrous phase in some mammals allows them to rest between breeding cycles.