Background sound such as birds, war, crockets, etc.

[Pelicula Film]

For my new documentary I need some background sounds like a quiet natural (wood) environment with only some birds in the neighboorhood, a heavy war-scene, a tropical night with the sound of crockets, etc.

Is there a database which you can recommend?

The sounds are meant to enliven a large amout of photo's.

(As far as I now, Adobe Premiere Pro doesn't have such a database itself.)

[daapap]

Creative Cloud App - Stock and Marketplace - Plugins. Look for Freesound Audio Search. It gives access to freeware databases and downloads the sounds directly into your project.

[Pelicula Film]

Thank you for your promising answer. Sorry I am not such an experienced premiere pro user. 

I have installed the Creative Cloud app. What do I do next?

[daapap]

As I said: Open the Creative Cloud app, go to Stock and Marketplace, go to Plugins, go to All Plugins, search for "Freesound", install.

In Premiere you can open the plugin in the Windows - Extensions menu.

My creative Cloud app is in German, but here is a screenshot:

[Warren Heaton]

Here is the share link for Freesound Audio Search: https://exchange.adobe.com/apps/cc/108490/freesound-audio-search

[John T Smith]

I have not used this so you will need to check to see if what you want is available

Free pictures-sounds-video https://pixabay.com/

[Warren Heaton · Accepted solution]

 Adobe Audition Downloads

Adobe® Audition® software includes thousands of uncompressed, royalty-free audio sound effects and music loop files. These files have been grouped together by type and style into ZIP archives that can be downloaded using the link on this page..

Full link URL: https://www.adobe.com/products/audition/offers/audition_dlc.html