Loud Exotic-Sounding Bird Heard in the Middle of Oxford

Question

Hi, this evening I heard this bird call near Oxford's natural history Museum at around 8pm. It was very loud! It has a distinctive call which repeated about once a minute or so (I'm 100% sure this is all one bird), almost like a Kookaburra at some points 
 
 What do you think it is? 
 (sorry for the talking over the recording!) 
 Play this audio clip

Hannah Hunter · Accepted Answer

This exact same call happens EVERY evening outside the natural history museum in Oxford! I have been trying to work it out. Recorded it with eBird and it came out with no suggestions! I don't think the falcon quite fits. So curious

YouOnlyKnowWhatHisNameIs · Answer

Hey thanks for replying, interesting it&rsquo;s there too! Here&rsquo;s my guess now: it&rsquo;s a recording of many different birds, probably birds of prey, played out loud at night to scare away pigeons and others which might roost and damage the brickwork (beats ugly metal spikes everywhere!)