Mammals also have more developed brains than other types of animals. Humans are mammals. This question often gets confusing because some sharks are "viviparous," meaning they give birth to live young.

Mammals have exceptional hearing. Using echolocation, bats can detect tiny insects flying in pitch-black darkness. Elephants can recognize the calls of their companions from roughly a mile away. And ...

Proteins degrade over time, making their history hard to study. But new research has uncovered ancient proteins in the enamel ...

Behavioral sequences across multiple animal species in the wild share common structural features. Proceedings of the National Academy of Sciences , 2025; 122 (20) DOI: 10.1073/pnas.2503962122 Cite ...

One possibility is that intelligence in vertebrates — animals with backbones, including mammals and birds — evolved once. In that case, both groups would have inherited the complex neural pathways ...

Researchers have long debated about the relationship between avian and mammalian intelligences. One possibility is that intelligence in vertebrates—animals with backbones, including mammals and ...

What types of animals have been to space? Melody Parker, ... Mammals have navels and bird hatchlings have small scars from where the umbilicus attached their gastrointestinal tract to the egg yolk.

The discovery of a newly identified species — the oldest saber-toothed animal found and an ancient cousin to mammals — fills a longstanding gap in the fossil record. CNN values your feedback 1.