Technical update: Pleo Gets 1.1 Update

The popular (but expensive) Pleo robot toy has just received a new 1.1 update, and the following are some of the improvements :-

Pleo's attitude and emotions change based on how you interact with him. A happy Pleo is one who receives a lot of attention while a sad Pleo is one who is neglected or abused.
Pleo has learned a new trick - he knows how to sit! Try holding his chin and rear at the same time. He'll then pull his front and back feet together. Give him a nudge back; don't forget to help him up when you want to keep playing.
Petting Pleo on his chin for a long period of time will coax him to sing a variety of melodies, after which he will remember the song he stopped on and may use it for other things such as calling for attention.
Pleo may occasionally get sick - coughing and sneezing! Can you nurse him back to health? by giving him lots of love and attention and feeding him his leaf.
Pleo has been picking up some strange habits as of late too - we've seen itchy feet and excessive chewing. What's your Pleo up to?

Take note that your Pleo will feel lethargic for several minutes after being updated, so pet him out of his misery or he'll enter digital depression.