Copyright infringement?

Couple of days ago I was trying to look for my blog in the internet and I searched my photography nickname in Yahoo and Google. When the result came in I found out that I have maybe hundreds of things related to my nickname showed up (not in some unmannerly website though).

I look at most of it and I understand why. The biggest contributor was whereby my photos from flickr are linked to search engine such as Flickr. Second biggest contributor is where my photos are linked to someone's website or blog featuring animals or plants that I photographed and lastly is my contribution to the scientific community via research papers published online.

I guess many of us are unaware of how many linked website have featured one single photos that we took and posted online.

My real question here is whether linking those photos without any permission from the source is a copyright infringement? Where in my case I was not notified by some or most of the blog or website operator. I know free publicity is always good but it will be good if the photos are linked to a website that helps in selling it :)

I understand that crediting the owner of the photo is a good thing, but in the end who really cares about who took the photo after hundreds of usage? I am not earning a living through my photography works but I do hope people will donate something for a poor photographer like me to invest on equipments for more good photos, don't you?.

Anyway, here is a definition of Copyright Infringement from Wikipedia that I took:

Quoting: " Copyright infringement is the unauthorized or prohibited use of works under copyright, infringing the copyright holder's exclusive rights, such as the right to reproduce or perform the copyrighted work, or to make derivative works."

Here are some of my most used photo in the web (without me knowing):

 1. Asian Paradise-flycatcher

 2. Bat Hawk

 

3. Leopard Cat

 I hope none of my photos here will be used without my permission. Any kind of donations are welcomed.