© Andrea HarveyMost of the world’s wild horses, such as the Australian brumby, are outside their historic native range.
Throughout history, humans have taken plants and animals with them as they travelled the world. Those that survived the journey to establish populations in the diaspora have found new opportunities as they integrate into new ecosystems.
These immigrant populations have come to be regarded as "invaders" and "aliens" that threaten pristine nature. But for many species, migration may just be a way to survive the global extinction crisis.
In our recently published
study, we found that one of the Earth's most imperilled group of species is hanging on in part thanks to introduced populations.
Megafauna - plant-eating terrestrial mammals weighing more than 100kg - have established in new and unexpected places. These "feral" populations are rewilding the world with unique and fascinating ecological functions that had been lost for thousands of years.
Today's world of giants is only a shadow of its former glory. Around 50,000 years ago,
giant kangaroos, rhino-like
diprotodons, and other unimaginable animals were lost from Australia.
Comment: There's been a spate of such incidents involving this species over the last 2 months, see also: Three dead beached whale sharks found in Indonesia
Whale shark found washed ashore in Tamil Nadu, India
Dead whale shark washes ashore on beach in Puri, India
Dead whale shark found in Tanza Bay, Philippines
Dead whale shark found in Tamil Nadu, India