I will also add, if you are new to finches, I completed some research on the cognitive health of finches (based on zebs- however it goes the same for goulds). Supporting them nutritionally allows a higher level of brain function which is used to enjoy life, ie 'play with toys'
Cognitive health = physical health
The brain of the Zebra finch is incredibly complex, and similar to that of a human. There needs to be significant nutrition to feed the body as well as the mind which controls physical development. Jarvis (2005) confirms that the previously labelled "primitive" regions of avian brains are sophisticated processing machines- similar to those in mammals. These regions carry out sensory processing, motor control and learning. Studies have also shown that the avian and those in mammals brain regions are comparable in their genetic and biochemical machinery.
The new relationship between humans and the avian species:
Because evolution is not linear, nor are the relationships in our animals kingdom. We share a great deal with these small creatures, including 98 per cent identical proteins, differing by just eight amino acids. They share the same sequence for language learning as humans and are capable of a great deal.
If you provide them with the resources to display all of their unique characteristics, you will be rewarded with a strong bond and fascinating pet.
Exclusive seed diets are nutritionally deficient in the fat-soluble vitamins (vitamin A, D3, E, and K, several B vitamins), certain amino acids, and some minerals including calcium, iodine, zinc, copper, and iron and most importantly proteins. Therefore we need to offer our birds a more varied diet to support their mental and physical development.
CONSUMABLES:
Therefore consumables should consist of more than just a store bought seed mixture. Many suggest that your finch should have 70% seed, and 30% fresh mixture. In the wild the birds eat quite a bit of sprouted seed, buds, insects, mineral supplements, etc. Therefore this is how the finches are fed here:
50% seed, 20% sprouted seed, 20% fresh produce, 10% additives (egg food, etc) and they are offered pellets in which they prefer Harrisons superfine