Ask Nature – https://asknature.org/
The key resource for exploring biomimicry examples; a rich resource to delve in to. Their resources area offers teaching resources, videos and articles to explore.
Biomimicry Toolbox – https://toolbox.biomimicry.org/
Great resources explaining the core concepts of biomimicry and a step-by-step approach to applying a biomimicry approach to design.
Center for Learning with Nature – https://www.learningwithnature.org/
A strong focus on engineering and maths is provided in this rich range of learning resources. Over 14 topics to choose from.