Think of a warm-blooded animal. You're probably picturing a cow or a dog, maybe an elephant. But how about a tuna?

Living beings can evolve to lose biological structures due to potential survival benefits from such losses. For example, certain groups of ray-finned fishes show such regressive evolution—medakas, ...

If you're reading this sentence, you might have a fish to thank. Fish were the first animals to evolve jaws. They use their jaws primarily to eat, but also for defense, as tools—such as to burrow or ...

pt. 1. Reproductive biology and life history. Gonads, genitals, and reproductive biology / Hartmut Greven ; Matrotrophy / Edie Marsh-Matthews ; Variation and evolution of reproductive strategies / ...

Why are there so many of species of coral reef fish? According to a new study, it’s because about 50 million years ago, some fish figured out how to bite food from hard surfaces. Evolution doesn’t ...

A study published in the Nature journal alters how the evolution of fish has been historically understood. Fossilized fish and other sea creatures have often been pivotal in new scientific discoveries ...

Why do you think giraffes have such long necks? It’s a question that has perplexed scientists for years. Do you think giraffes have long necks to reach food in high places? Maybe you are onto ...

The cichlid fish of Africa's Great Lakes have formed new species more rapidly than any other group of vertebrates. A new study shows that the ease with which these fish can develop a biological ...

Earth, rocks, evolution, and fish : background information to understanding fish evolution -- Glorified swimming worms : the first fishes : origins of chordates and the first vertebrates -- Jawless ...

Whole skeleton of Dipterus, an extinct lungfish from the middle Devonian period. Specimen (UMMP 16140) from the University of Michigan Museum of Paleontology. ANN ARBOR—If you're reading this sentence ...