1. Redwing - (song thrown into this call to cause a bit of confusion) Call is a piercing 'tseep' which can often be heard at night as flocks fly over. Often just a single bird calls in a flock, so a single call at night might actually be a really large flock. Similar to Blackbirds 'see' call that can also occasionally be heard at night, but the harsh piercing tone stands out. 2. Jay - a harsh screaming noise that can often be heard at some distance away. 3. House Martin - a rather bubbling call, that is most similar to Sand Martin, but is made up of lots of single notes, whereas Sand Martin is much more of a chattering set of calls. 4. Garden Warbler - Quite similar to Blackcap, but is a garbled, flutey song that lacks any real repetition. 5. Common Sandpiper - Song a repeated whirring 'phrase' that rises in amplitude throughout.