Here's a breakdown:

* Adaptive radiation: A rapid burst of evolutionary diversification in which a single ancestral species gives rise to many new species that are adapted to a wide range of ecological niches.

* Short period of time: "Short" is relative, but it typically refers to a shorter timescale compared to the usual pace of evolution. This can be thousands or millions of years, depending on the organisms and the environment.

* New species: The new species will have evolved distinct features, such as different body shapes, feeding habits, or behaviors, to fill those ecological niches.

Key factors contributing to adaptive radiation:

* Availability of new ecological niches: This could happen due to environmental changes, colonization of new habitats, or the extinction of competitors.

* Reproductive isolation: Barriers to gene flow between populations can lead to the evolution of distinct species. This can be driven by geographic isolation, behavioral differences, or other mechanisms.

* Key innovations: The evolution of novel traits that allow a species to exploit new resources or environments can accelerate diversification.

Examples of adaptive radiation:

* Darwin's Finches: The diverse beaks of finches on the Galapagos Islands evolved from a single ancestor through adaptive radiation in response to different food sources.

* Hawaiian Honeycreepers: This group of birds with diverse beak shapes evolved from a single ancestor to exploit different food sources and habitats in the Hawaiian islands.

* Cichlid Fishes in Lake Victoria: This lake is home to hundreds of cichlid species, all derived from a single ancestral species.

Adaptive radiation is a powerful evolutionary process that can lead to rapid diversification and the creation of new species.