Rejected nature recordings

I am new to Pond5 and have uploaded a large bunch of nature sounds. I dear to say they are of high quality with birds wind, water and so on. All of them got rejected with no comment. Is this normal?
I also have uploaded a few pretty crappy video files, in my opinion, and they got all accepted...

They got rejected not because of the quality but because there is probably already a high volume of those available on the website. I get SFX rejections sometimes too because p5 is starting to put a cap on one particular area being overly saturated, which is a good move if you ask me

Hello guys,

Can anyone tell me what types of SFX are acceptable by Pond5? Clearly, nature recordings aren't, but I would like to know which ones are.

Thanks! ;)