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Seven easy rules of thumb to help with bird identification

Looking for a bit of ID help? Try these helpful methods from fellow bird lovers!

Posted 6 min read
A Great Tit perched on a moss covered branch.
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If it looks like a duck…

The saying, "If it looks like a duck, swims like a duck, and quacks like a duck, it probably is a duck", is a well-worn phrase meaning that if something looks and acts in a certain way, it’s probably the thing it appears to be.  

It’s also a good example of using a ‘rule of thumb’. From hundreds of bird species, we can quickly narrow it down to the type of bird!  Similarly, there’s a quote, often attributed to Bill Oddie, that goes something like, “If you hear a woodland bird song you don’t recognise, it’s probably a Great Tit”. Lots of us are familiar with a Great Tit’s 'tea-cher, tea-cher' or 'see-saw, see-saw' call, but can be flummoxed by its numerous other calls.   

Such rules of thumb can prove incredibly helpful. They are, after all, derived from many people’s many years of observations and bird watching. So we reached out to the birdwatching community and to many our wonderful RSPB supporters to discover some of the best-loved pointers for bird ID.  

Former RSPB chair Kevin Cox, RSPB president Dr Amir Khan, RSPB Chief Executive Beccy Speight.

Top seven golden guidelines

1. A Crow in a crowd is a Rook, a Rook on its own is a Crow

This describes how Carrion Crows are mostly encountered alone or in pairs, whereas Rooks often feed together in large, sociable groups. Although not infallible – groups of Crows might be seen together where there are good feeding opportunities, for example – it is still a good general principle for distinguishing between these commonly confused birds. 

Another way to distinguish a Rook is to look for the bare patch of grey-white skin around the base of its bill. From a distance a Rook’s bill looks grey, whereas a Crow’s is all black. Some people think of a Rook as being black and white (if you're generous about a grey beak!) – like a chessboard. 

2. If you see a bird creeping up a tree, it’s a Treecreeper; if it’s going down the hatch, it’s a Nuthatch!

This wonderfully phrased piece of advice from RSPB Scotland Communications Officer Molly Martin, helps to differentiate between two tree-dwellings birds, Treecreepers and Nuthatches.  

It’s a useful guide: Treecreepers only climb up or along trees, whereas Nuthatches are the only UK birds that can go headfirst down a tree. But it’s not foolproof. The skilful little Nuthatches are equally adept at going up a tree! 

It’s also helpful to remember that these two birds look very different too. Treecreepers are mottled brown on top which acts as camouflage against a tree. A Nuthatch is a much more colourful bird, with bluey-grey feathers on top, a rusty-orange belly and a bandit-like swoosh of black on its head.  

3. CooT whiTe and MooRhen Red

Coots and Moorhens are two birds commonly encountered on ponds, rivers and other waterways. And, despite their differences in appearances, they are frequently mixed up. This rule is to useful way to identity them by beak colour, with a Coot’s being white and a Moorhead’s red.  

Another helpful reminder is that “Moorhens have ‘more’ colours”. A Coot is strictly black and white, while a Moorhen has black, white, red and yellow colourings. 

4. If it hovers, it’s a Kestrel

While other birds of prey such as Buzzards and Ospreys can hover for short periods of time, none have the stamina or are as good as a Kestrel! 

Kestrels fan their tails, beating their wings to stay in place, and holding their heads still to focus on potential food such as a Field Vole below. It is an incredible skill to behold. Silently hovering, head down, until the Kestrel suddenly swoops at speed, plunging its talons into its unsuspecting prey!   

A Common Kestrel shown with its wings spread wide, hovering in the air.

5. The lesser fella's legs are yella

This is one for gull fans! Often grouped together as ‘seagulls’, the UK has six species of commonly occurring breeding gulls. Namely: Herring Gull, the Lesser Black-backed Gull, the Great Black-backed Gull, the Black-headed Gull, the Common Gull and the Kittiwake.  

This rule of thumb focuses on Great and Lesser Black-backed Gulls. As you might expect, the Great Black-backed Gull is the bigger bird, but size can be deceptive especially when seen from a distance. Instead look out for its legs. A Great Black-backed Gull has pink legs, while the lesser fella’s are yellow.  

Beware, however, this only works with adult Great and Lesser Black-backed Gulls. Young Lesser Black-backed Gulls have pink legs for at least their first two years.

6. If it's 'not' big, 'not' small, 'not' got a long or curved beak, 'not' got colourful legs, and 'not' got obvious wing bars... it's a Knot!

This rule is useful when watching wading birds in winter. Many thousands of water birds including geese, ducks and wading birds such as Knot and Dunlin head to the UK from colder countries, flocking to our muddy estuaries and shores for food.  

Flocks can reach their thousands and can include a number of different wading birds. Some can be made out by distinctive features: a Curlew is recognised by its long, curved bill and has the accolade of being Europe’s biggest wading bird, while Redshanks have bright red legs.   

Knots, meanwhile, are less distinctive. In winter, which is when you are most likely to see them in the UK, they are pale grey on top and white below, with a medium sized bill. They are easily confused with Dunlins, which are similarly greyish on top and white below. Dunlins, however, are smaller – around the size of a Starling, while Knots are almost Blackbird sized.  

A pair of Red Knots in winter plumage hunting in shallow water.

7. If you see something turning over stones on the beach, then it’s a... Turnstone!

Yes, the names say it all! Head to the coast, particularly rocky shores, and look out for a smallish bird flipping over stones in search of food. And bingo, it’s a Turnstone. A bit bigger than a Blackbird, these are pretty birds with chestnut, brown and white colouring.  

Turnstones can be seen throughout the year in the UK, with winter a particularly good time, as many fly in from their breeding grounds in the Arctic. As well as these winter migrants, Turnstones arrive as passage migrants in summer and spring. These Turnstones breed in Scandinavia stopping here on route to refuel, before continuing to the West African coast for winter.  

Turnstone

What rules of thumb do you use?

But of course all birds know that rules are made to be broken! So while these guidelines can’t guarantee you’ll ID the bird correctly, they can be a help while you hone your skills.  

Have you any rules of thumbs that you use? We’d love to hear from you at NotesonNature@rspb.org.uk  

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