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By that definition, horses that were introduced to North America by humans in 16th century are not invasive because they existed in North America 10,000 years a
by fbarred 2y ago
By that definition, horses that were introduced to North America by humans in 16th century are not invasive because they existed in North America 10,000 years ago.
- pvaldes 2y agoSo they fill a niche in a place that evolved with extinct horses and can sustain another species of horse. If they pass a threshold where they drink all the water for example (desert pools on Australia with endemic desert fishes), they became invasive and must go.
- dagmx 2y agoThe article also does say that Grizzlies come and go, that the significance here is it’s a female with cubs. So it’s not like grizzlies aren’t present at all on the island. Of course there could be a boom but apex predators tend to not be super boomy since they’d outstrip their own resources first.