There are varieties of blood colour in the different species.

[{ "selector": ".fussc-a", "duration": "500ms", "fill": "forwards", "delay": "500ms", "keyframes": [ {"offset": 0, "transform": "translateX(calc(360px - 189px))", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }, { "selector": ".qpbdp-a", "duration": "500ms", "fill": "forwards", "delay": "750ms", "keyframes": [ {"offset": 0, "transform": "translateX(-331.9999999999998px) scale(0.15)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0) scale(1)", "opacity": "1"} ] }, { "selector": ".anlnn-a", "duration": "500ms", "fill": "forwards", "delay": "1250ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }, { "selector": ".liumf-a", "duration": "500ms", "fill": "forwards", "delay": "750ms", "keyframes": [ {"offset": 0, "transform": "translateX(calc(360px - 48px)) scale(0.15)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0px) scale(1)", "opacity": "1"} ] }]

Creatures with backbones or Vertebrates own red-colored blood.

[{ "selector": ".mtjqd-a", "duration": "500ms", "fill": "forwards", "delay": "750ms", "keyframes": [ {"offset": 0, "transform": "translateX(-331.9999999999999px) scale(0.15)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0) scale(1)", "opacity": "1"} ] }, { "selector": ".orawp-a", "duration": "500ms", "fill": "forwards", "delay": "1250ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }, { "selector": ".iioqo-a", "duration": "500ms", "fill": "forwards", "delay": "0ms", "keyframes": [ {"offset": 0, "transform": "translateX(calc(360px - 184px))", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }, { "selector": ".xpqkt-a", "duration": "500ms", "fill": "forwards", "delay": "500ms", "keyframes": [ {"offset": 0, "transform": "translateX(-179px)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }, { "selector": ".ucgxt-a", "duration": "500ms", "fill": "forwards", "delay": "750ms", "keyframes": [ {"offset": 0, "transform": "translateX(calc(360px - 48px)) scale(0.15)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0px) scale(1)", "opacity": "1"} ] }]

Red blood contains haemoglobin, and heme has Iron in it.

[{ "selector": ".gwerm-a", "duration": "500ms", "fill": "forwards", "delay": "1000ms", "keyframes": [ {"offset": 0, "transform": "translateY(calc(600px - 453px))", "opacity": "1"}, {"offset": 1, "transform": "translateY(0)", "opacity": "1"} ] }]

Iron makes the blood look red. It also gets red when the lung intakes oxygen and Iron binds oxygen molecules.

[{ "selector": ".wagpg-a", "duration": "500ms", "fill": "forwards", "delay": "500ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }, { "selector": ".rwuem-a", "duration": "500ms", "fill": "forwards", "delay": "750ms", "keyframes": [ {"offset": 0, "transform": "translateX(-334.58666666666636px) scale(0.15)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0) scale(1)", "opacity": "1"} ] }, { "selector": ".fdemj-a", "duration": "500ms", "fill": "forwards", "delay": "1250ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }, { "selector": ".pzkjq-a", "duration": "500ms", "fill": "forwards", "delay": "750ms", "keyframes": [ {"offset": 0, "transform": "translateX(calc(360px - 48px)) scale(0.15)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0px) scale(1)", "opacity": "1"} ] }]

Sea creatures have blue blood in them. It is because of copper in hemocyanin.

[{ "selector": ".teoek-a", "duration": "500ms", "fill": "forwards", "delay": "500ms", "keyframes": [ {"offset": 0, "transform": "translateY(-70px)", "opacity": "1"}, {"offset": 1, "transform": "translateY(0)", "opacity": "1"} ] }, { "selector": ".nfmoi-a", "duration": "500ms", "fill": "forwards", "delay": "500ms", "keyframes": [ {"offset": 0, "transform": "translateY(calc(600px - 535px))", "opacity": "1"}, {"offset": 1, "transform": "translateY(0)", "opacity": "1"} ] }, { "selector": ".neakf-a", "duration": "500ms", "fill": "forwards", "delay": "750ms", "keyframes": [ {"offset": 0, "transform": "translateX(-335px) scale(0.15)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0) scale(1)", "opacity": "1"} ] }, { "selector": ".gaznj-a", "duration": "500ms", "fill": "forwards", "delay": "750ms", "keyframes": [ {"offset": 0, "transform": "translateX(calc(360px - 50px)) scale(0.15)", "opacity": "100%"}, {"offset": 1, "transform": "translateX(0px) scale(1)", "opacity": "100%"} ] }, { "selector": ".mmdxt-a", "duration": "500ms", "fill": "forwards", "delay": "1500ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }]

Leeches and dismembered body worms have green colour blood in them because of chlorocruorin.

[{ "selector": ".suuwn-a", "duration": "500ms", "fill": "forwards", "delay": "500ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }]

Marine worms have purple blood because the hemerythrin protein and oxygen dissolve in each other and make the colour purple from transparent.

[{ "selector": ".wqfqf-a", "duration": "500ms", "fill": "forwards", "delay": "500ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }, { "selector": ".fnsor-a", "duration": "500ms", "fill": "forwards", "delay": "1000ms", "keyframes": [ {"offset": 0, "transform": "translateY(-391px)", "opacity": "1"}, {"offset": 1, "transform": "translateY(0)", "opacity": "1"} ] }, { "selector": ".wbpca-a", "duration": "500ms", "fill": "forwards", "delay": "1450ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }, { "selector": ".dawpj-a", "duration": "500ms", "fill": "forwards", "delay": "750ms", "keyframes": [ {"offset": 0, "transform": "translateY(-366px)", "opacity": "1"}, {"offset": 1, "transform": "translateY(0)", "opacity": "1"} ] }]

Sea Cucumbers named marine animals have yellow blood. This Holothuroidea species contains hemocyanin in its blood. [{ "selector": ".ozwjb-a", "duration": "500ms", "fill": "forwards", "delay": "0ms", "keyframes": [ {"offset": 0, "transform": "translateX(-111px)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }, { "selector": ".irtea-a", "duration": "500ms", "fill": "forwards", "delay": "500ms", "keyframes": [ {"offset": 0, "transform": "translateX(calc(360px - 239px))", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }, { "selector": ".mdtnp-a", "duration": "500ms", "fill": "forwards", "delay": "750ms", "keyframes": [ {"offset": 0, "transform": "translateX(-310px) scale(0.15)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0) scale(1)", "opacity": "1"} ] }, { "selector": ".pupul-a", "duration": "500ms", "fill": "forwards", "delay": "1250ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }]

Hemocyanin works like haemoglobin, which means the blood contains oxygen in it. [{ "selector": ".bqrbb-a", "duration": "500ms", "fill": "forwards", "delay": "500ms", "keyframes": [ {"offset": 0, "transform": "translateY(-165px)", "opacity": "1"}, {"offset": 1, "transform": "translateY(0)", "opacity": "1"} ] }, { "selector": ".lgcpq-a", "duration": "500ms", "fill": "forwards", "delay": "500ms", "keyframes": [ {"offset": 0, "transform": "translateY(calc(600px - 535px))", "opacity": "1"}, {"offset": 1, "transform": "translateY(0)", "opacity": "1"} ] }, { "selector": ".ozxjw-a", "duration": "500ms", "fill": "forwards", "delay": "1000ms", "keyframes": [ {"offset": 0, "transform": "translateX(-335px) scale(0.15)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0) scale(1)", "opacity": "1"} ] }, { "selector": ".xiosq-a", "duration": "500ms", "fill": "forwards", "delay": "1000ms", "keyframes": [ {"offset": 0, "transform": "translateX(calc(360px - 50px)) scale(0.15)", "opacity": "100%"}, {"offset": 1, "transform": "translateX(0px) scale(1)", "opacity": "100%"} ] }, { "selector": ".escse-a", "duration": "1200ms", "fill": "forwards", "delay": "1250ms", "keyframes": [ {"offset": 0, "transform": "translateY(-66px)", "opacity": "1"}, {"offset": 1, "transform": "translateY(0)", "opacity": "1"} ] }]