Age fit: 6–10 · 620L (~3rd grade) · Right at their current reading level · Picture book · 1975
A 1975 classic that holds up: gorgeously illustrated and densely informative without feeling didactic, following a mink from Minnesota headwaters to the Gulf, with asides on river towns and ecosystems that reward rereading.
Age fit: 4–8 · 620L (~3rd grade) · Right at their current reading level · 32 pages · Picture book · 2016
The best entry point to experimental thinking for this age—Ada's smell mystery is genuinely absorbing, and Beaty's rhyme scheme carries reluctant readers without condescension.
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I genuinely enjoy listening to them and reading them! The author also provides many ideas for further learning and experiments on her website.