Birds Are Getting Smart Enough to Open Doors [VIDEO]
2014.05.26
![door1.jpg door1.jpg](/files/attach/images/3004/742/895/013/door1.jpg)
We all know crows are intelligent, but how about swallows? They are just as smart. A group of them have built a nest in an underground carpark that has electronic doors. They couldn't get out, because they wouldn't be able to open those doors. But that wasn't the case at all:
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