Birds again!

Birds arrive - all shapes and sizes;
fill our garden with surprises:
tiny coal tits, three by three,
two young rooks who want their tea:
"Serve us now - no ifs or buts -
Sunflower seeds and monkey nuts!"

© Celia Warren 2017


I've spent some time poring over bird books and bird online sites, trying to determine whether these two birds (now regular visitors to our garden) are rooks or crows. My conclusion is that they are juvenile rooks. What do you think?