Northern Shrike L e borealis

rubbish photos of an interesting taxon; the juv shown in flight and head on was of the brown form with dense underpart barring and a really brown wash to its upperparts totally different to Eurasian birds -- surely a separate species? the adult shows the small white patch at the primary base and the grey lower rump and uppertail coverts but most of the time they were very skittish and not easy to get a good look at