What circumstances could make it hard for scientist to gather information about lost species? what can they do to overcome these issues

There are many circumstances that scientists face and there are many ways to overcome these issues.

Explanation:

There are around 14,00 species that are endangered as of now. The main reasons for their extinction is either loss of habitat and loss of genetic variation. As human population increases, natural resources keep reducing as a result, species gradually become endangered. Poaching also significantly contributes to endangering of these species.

Scientists face a lot of problems to find information about such species. First of all, problem is to find such organisms as they are so rare. Scientists may make the issue of endangering species worse by making the poachers more visible to the species.  

To overcome these issues, scientists come up with many unique and creative steps, use latest technologies like use of drones to locate these hard finding issues and camera traps.

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2%? i tried finding the exact sorry if it's not 100% correct ; -;