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Answer 1

The conservationists have had difficulty finding Baw Baw frogs because the animals  aren't easily seen or heard.

Answer: Option 3.

Explanation:

According to the article, the conservationists who work in the working of making the life of the animals better and conservation of the animals who are in the endangered species, there was training of the animals at two border collies.

This was done because one of the most endangered species which was the baw baw frogs were very tough to trace. So special training of some animals was needed to trace them.