Vicky Singleton, Conservator at the Museum of Zoology, writes:
Since starting at Cambridge University Museum of Zoology a number of specimens have caught my eye. One of my first roles at the beginning of the year was helping to empty and safely pack the British Birds case. This gave me the opportunity to examine a number of birds, most of which I recognised by name, but would struggle to recognise by sight (especially in flight) or I would get one species confused with another. One such example is the difference between the Swift, Swallow and House Martin. Having often wondered whether a fast flying summer bird was a Swift or Swallow, or even a House Martin I used the recent bird case decant to examine these specimens in detail so I could recognise the differences.
As you can see from the photo the appearance of the Swift is black-brown on both the upper and underparts with a pale chin, whereas the Swallow has blue-black upperparts and white underparts, with a dark chest band and red throat (I have ingrained this into my memory by thinking ‘the Swallow has a red throat to swallow’). The House Martin has blue-black upperparts and white underparts, but it also has a prominent white rump. Although difficult to tell in flight, there is a difference in the tails of the three species: the Swift and Swallow both have forked tails, but the Swift’s is short in comparison with the deep fork and long streamers of the Swallow. The House Martin’s is short and has a wider fork than the other two.
Although relatively small, these observations paid off recently during a trip to the Lake District when I found myself confidently recognising Swallows as such, something I would have been unable to do in the past.