This nest belongs to the littlest bird of prey in the UK.
And this huge nest belongs to the UK's largest bird of prey!
This is the golden eagle.

It's often called "king of the birds", and you can see why.
It's not often that you'll see one of these in the wild, unless you live in Scotland or the Lake District.
This is the little merlin falcon.

It's the littlest bird of prey in the UK.
They're far more widespread than the golden eagle, and you may even see them in towns and cities.
They're so little that in medieval times they were known as the ladies bird, and they sat on the shoulders of queens and princesses.
The little merlin falcon weighs only 200g - that's as much as one cupful of sugar.
Whereas the large golden eagle is an amazing fifty times heavier, at 10kg.

That's the same as fifty cups of sugar!
The little merlin falcon is just 20cm long...
...while the golden eagle is 120cm long - six times longer.
The little merlin eats other little birds, grabbing them mid-flight with its little sharp beak.
Whilst the golden eagle eats larger prey, eating rabbits and even deer. It flies low and grabs them clean off the ground with these large talons.
The eagle's talons are four times larger than the little merlin's.
But the best way to see the difference between the UK's biggest and smallest birds of prey is to see them fly.

The little merlin's wingspan is only 30cm long...
..but the large golden eagle's is 210cm long - seven times longer.
Little and large - but both equally Brilliant Creatures!