Monarch Life Cycle

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Almost Doubled in Size by Day 2

When I looked the second day after hatching, the caterpillars were noticeably larger already. Again, using my thumb for frame of reference.
Monarch Caterpillar (Danaus plexippus)

monarch Danaus plexippus garland texas milkweed SUNSET BLOOD FLOWER Scarlet Milkweed Asclepias Curassavica monarch caterpillar caterpillar hatchling milkweed leaf 2 days old

From Insects and Spiders