black woodpecker hollows hollow

animals anthropogenic bioengineering bionomics biotechnology bird birding birds black breeding damage diurnal dryocopus ecology effect electric electrical electricity electropure environment feather flicker flier flyer forest grid guide hollow impact influence line lines mains martius nest nesting network pest picus pole power species stinkpot support synanthropic tour varment varmint wanker watching wood woodpecker woodspite