On that note, I was bringing peas to the ducks yesterday and found a fat earthworm along the way which looked dead but fresh, so I hung it over the side of the bowl.
The first duck to arrive was eyeing it suspiciously... what is this dark sorcery happening with our bowl... and moved away.
The second one tried to grab it but it didn't work out so it flopped back (it was a large one) and she got visibly scared and moved away.
The third duck came in, was delighted, grabbed the worm and ran away because everybody else, including the first two, started running at her to make her share.
They are somewhat similar to humans....