Then we come along and introduce competitive species, our own.

They even complain about our sea farms because we introduce new species.

Today, much more thought is put into introducing non-native species.

It is threatened by deer, sheep, and introduced species of plants.

The people who want to introduce alien species do not understand our environment and bio-diversity, they are just playing at it!

It appears to have disappeared from the lake itself due to pollution and introduced species.

The reasons for its extinction are believed to be habitat loss, pollution, and introduced species.

China has had a long history of intentionally introducing species considered beneficial.

Of these, perhaps the most serious are introduced species.

There is a risk of introducing new invasive species that will become problems in the future.