by Michael » Tue Aug 24, 2010 11:20 pm
This is a two part answer or more like two major reasons for this:
1) Cleanliness and habit. Even if I did leave the food in the cage all day (and btw with Truman being young, forget about current injury situation, I still do for the most part), both parrots tend to eat in the mornings and evenings anyway. In the wild they don't eat mid day. They tend to nap and relax in the middle of the day. So even with pellets which don't really go bad, there's just more likelihood that they will poop on them or throw broken toy bits in the bowl. So by removing the food between meals, it eliminates the mess. Oh and also it eliminates playing with food, throwing it all around the cage just for the hell of it. When they have too much food, they have no appreciation for it and just make a mess.
2) Training and taming. Feeding just twice a day plays a huge impact not only for training tricks but just for handle ability. My birds are hungriest when I see them (morning and evening). They have no way of sneaking a meal in prior to seeing me as the food is not there. They value treats from me but even beyond that they just value spending time with me even if they're not getting food. It's that I've gotten to have so many experiences where I'm "the good guy" who was providing food when the bird was hungry that it just bonds and trusts me overall. For trick training, this creates hunger and motivation for earning treats (see all my parrot training articles to get into this point but as you see it's not the only reason). Finally it creates an opportunity for the birds to be rewarded for going back into the cage (full meal). This creates a schedule of feeding that revolves around their interaction with me. It makes them much more handleable and guarantees that they are getting positively reinforced both out of the cage and in.
Parrots in the wild do not eat all day long so especially all the more they shouldn't be eating all day long in captivity where they get far less physical exertion as it is! If they are bored, they should play with toys rather than be picking up more calories. If you don't want to do training, you can substitute it with foraging opportunities out of the cage at the same intervals as I specified training. Foraging toys are basically an automatic self-occupying equivalent to parrot training.
Lastly I would like to point out that parrots have a crop. It's like a doggy bag for the food they want to save for later. Regardless if they are free fed or not, they tend to fill that crop up in the mornings and evenings. The evening fill up gets them through the night and the morning fill up through the day. If they can sleep 10-14 hours on a crop load of food, what makes you think they can't go 10 hours between meals without a buffet served in front of them 24/7? Fact is they fill up their crop and then gradually digest it throughout the day as they need it. From my personal experience with my birds it seems that the crop can hold 2 full days worth of food but they still eat frequently. So they go from 90% full crop to 60% full crop, then fill it up to 90% again. I weigh my birds frequently so this is the (ballpark) conclusion that I come to. So the crop acts like a buffer that gets filled and reduced over time. If you are feeding twice a day, that crop will never go fully empty but merely create a hunger to top it off again in the evening. This can be used to improve your relationship with the parrot through taming, training, bonding, and being the good guy for putting it back in the cage for a meal. By letting the parrot desire the things you give it (by not providing them in your absence), YOU get to take full credit for these good things in the parrots mind and get the better trust/relationship for it.