I had to smile when I saw this - my spinach has had tiny little bites taken all around the leaves.
At first, I thought it was either a snail or caterpillar, but later in the day I saw a bird pecking away and obviously enjoying this treat.
The bird flew away as soon as it saw me and I think it was the cape robin - I have seen the robin before, scratching around in the mulch of my other containers looking for grubs - so may be the robin has developed a taste for spinach!!
So far, it has only taken small bites out of the spinach and not the swiss chard so I am happy to let him/her share with me.