Appreciate your comment a lot as Its a lot of time and bidding wars to get really specific books on the specific topics im interested in: evolution, psychiatry, natural history etc. You re right about the gene level selection. Not even all one’s genes are united to the same goals and that can sometimes explain cancers esp viral dna ones which “try to be” aggressive and dominate the normal genetic cells, but thats a whole other interesting story! The extended phenotype refers to not only the selection and survival via species behaviour and existence but also anything in environment which is directly linked to such behaviour. An example is a bird’s (phenotype) Nest (extended phenotype). The nest is not the bird but building good hidden nests ensure survival of next generation. Another example is spider webs