Science

Blood chemistry reveals why some animals bleed blue, green or purple

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 02/11/2026, 19:55:25 UTC.

Briefings

A 2026 study indicates that blood color varies significantly across animal species, ranging from purple to white, challenging the assumption of universal red. The evidence highlights that this variation is not due to a single chemical cause but rather a complex interplay of genetic, environmental, and physiological factors. The study provides a snapshot of this biological diversity but does not specify the exact mechanisms driving the color shift in specific species.

Key points

• Blood color varies across animal species, including purple, yellow, green, and white variants.

Context

This research addresses a long-standing biological question about why blood appears different in various animals, moving beyond the common perception of red.

Limitations

The evidence is limited to a single study from 2026 and does not specify the exact mechanisms or provide data on specific species.

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