Other animals like cows get lots of calcium by eating grass
They then pass on some of that calcium by milk
The rest they put primarily in their own bones and teeth and secondarily in other parts of their body
So unless someone eats cow bones then milk is a much better source of calcium then meat
In the case of female birds they put calcium primarily in the skeleton and the shells of eggs
Again their meat is not a good source of Calcium
Because humans do not have enough time to eat plants or meat all day the only time efficient means they have to get calcium that I know of are
1 Milk
2 Lots of Chia seeds
Any other plant I know of will make people painfully to full
3 Calcium supplements or food with Calcium artificially added to it as an extra ingredient like Calcium fortified orange juice or soy milk or tofu
Other animals eat for many hours more per day than humans and can digest calcium containing foods that humans have trouble digesting
