The covers are worn and scuffed. 

The top page edges are dusty dirty. 

There are some pages with small tears. 

The first few pages front and back of 'Evolution' are spotty and there are a few pages loose from the book. 

There are some spotty pages in other books too.

'Ecology' has writing on the cover, also some writing/underlining on pages. 

'Animal Behavior' has some loose pages and is missing page 167/168.