That is, the initial hybrids may produce viable offspring by mating back to one of the parent species but not the other. The resulting mixtures of genes may introduce new combinations that are ...

A new species of dinosaur has been identified more than a decade after a large number of ancient skeletons were found in Spain -- and researchers expect more species to be discovered. The ...

Two distantly-related species that split 60 million years ago have produced an offspring on the forest floor of the French Pyrenees. We’re talking about ferns, but still, reuniting after such a ...

Runny nose, itching eyes, worsening asthma symptoms—the effects of hay fever are nothing to sneeze at, experts say, warning ...

Tipping points are the death of ecosystems. So scientists watch as warning signs gradually worsen until an ecosystem reaches ...

The most common definition of a species is that a species is a group of organisms that can successfully breed to produce fertile offspring. This is known as the biological species concept. This ...

Plants produce an enormous abundance of natural products. Many natural plant products are ancestry-specific and occur only in certain plant families, sometimes only in a single species.

Some snake species lay eggs, while others give birth to live young. Species that give birth to live young produce eggs as well, but the eggs hatch inside the mother. Most egg-laying species ...

While mammals are known for feeding milk to their young, some bird species produce a similar substance called crop milk. Pigeons, doves, and flamingos secrete this nutrient-rich fluid from their ...