[ipsum2]

> When we started doing research we found out there is a guy in the States that is teaching crows to collect coins. His name is Joshua Klein.

It's commonly agreed that this never worked successfully in the wild.

> In that correction the NY Times states that the experiments never succeeded in teaching the crows to drop the coins into the slot.

https://en.wikipedia.org/wiki/Joshua_Klein#Crows

> Klein did get a professor at Binghamton to help him try it out twice in Ithaca, with assistance from a Binghamton graduate student, and it was not a success. Corvid experts who have since been interviewed have said that Klein’s machine is unlikely to work as intended.

http://www.nytimes.com/2009/04/12/magazine/12letters-t-CORRE...

[joe_the_user]

Coins seem like they'd very difficult for a bird to handle - they're heavy for their volume and can't be bitten into.