The scientist was likely observing an otter due to its characteristics like living in water, having 4 legs, body temperature variations, egg-laying in sand, and similar-looking hatchlings.
The organism the scientist was probably observing based on the provided observations is an otter. Otters primarily live in water, have four legs for both walking and swimming, and their body temperature can fluctuate with the outside temperature. Additionally, otters lay their eggs in sand, and their hatchlings resemble their parents.
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