Designs #49 & #50. Design with a bird's nest at the top of a tree. If you are looking to use the logo on book spines the design really needs to be within a narrow vertical shape, and capable of being just black and white as this gives more scope for design of book covers and avoids colour clashes. With #50 the words Nesting Tree would either be black or reversed out depending on the the background colour.
#98. Stylised tree which partly encloses and shelters a nesting bird. The shape of the tree is more similar to the needles of a cedar than the actual tree seen as a whole.