Best Calcium-Rich Foods for Backyard Birdss

Ranked by calcium content among foods safe for backyard birdss in the Creature Feast catalog.

Spinach per 100g: 99mg calcium (moderate bioavailability due to oxalates) Spinach contains roughly 99mg of calcium per 100g, one of the highest levels among safe feeder greens. However, spinach also contains oxalates that bind some of that calcium, reducing bioavailability. For nesting females that need calcium for eggshell formation, spinach should be offered alongside lower-oxalate greens to balance the calcium supply.

Dandelion greens per 100g: 187mg calcium (good bioavailability) Dandelion greens provide about 187mg of calcium per 100g with good bioavailability, making them one of the best natural calcium sources for garden birds. Allowing dandelions to grow near your feeding station gives ground-feeding birds access to both the calcium-rich leaves and the seeds. Nesting females actively seek out calcium-rich plant material during egg production.

Broccoli per 100g: 47mg calcium (high bioavailability, low oxalate) Broccoli florets contain about 47mg of calcium per 100g with excellent bioavailability since broccoli is very low in oxalates. Finely chopped broccoli on a platform feeder attracts species that forage on small plant fragments. The calcium is especially valuable during spring when breeding females are forming eggs and pulling calcium from their medullary bone reserves.

Leafy greens per 100g: 100-150mg calcium (varies by variety) Leafy greens as a group provide moderate calcium content, and varieties like kale and collards deliver 100-150mg per 100g with low oxalate interference. Chopped leafy greens placed on a platform feeder give breeding birds access to bioavailable calcium during the critical egg-laying window when skeletal calcium stores become depleted.

Parsley per 100g: 138mg calcium Parsley contains about 138mg calcium per 100g and is readily consumed by many garden bird species when finely chopped. Its calcium-to-phosphorus ratio supports efficient absorption, which matters during the breeding season when female birds need to deposit roughly 40% of their body calcium into each clutch of eggs.