"...and a nose of a kingfisher" - except that the kingfisher dives on that video with open mouth. Something's not right here, what's the point of modelling closed one for "no splash"/no soundwave. It's also low pressure -> high pressure in case of the diving bird and high pressure -> low pressure in case of train leaving a tunnel.
Many of these solutions are about energy minimization. Sometimes its the lifetime energy. Sometimes, its the energy of creation/instantiation. If you start from a bundle of cells you don't have the option to yank a mecanno box of new parts into the system ready-made: you have to use cellular generative methods, to construct largely fluid and jelly filled sacs, which then accrete things, or form surfaces, and you badly want to minimize the energy cost of doing that, within the constraints of the physical system you are in.
Whales could be half a mile long and razor. Thin. or globular. They went somewhere inbetween for reasons.
Thats what I think, anyway. I base this on (mis) readings of D'Arcy Thompson. 1917.
An interesting database related to biomimicry: https://asknature.org/
Some more real life Bio inspired things - LED inspired from fireflies nano structures, Velcro, camera from human eye more at
https://asknature.org/?s=&p=0&hFR%5Bpost_type_label%5D%5B0%5...
I must say, as I enjoy reading about biomimicry. Imitating the environment enhances creativity and brings out great architectural designs if it's well done! These are some interesting information about biomimicry too: https://www.arch2o.com/biomimicry-enhances-architecture/
Yeah nature got us here, but "here" is a local optimum based on evolutionary selection forces. If you were to design things based on biomimicry rather than first principles, planes would flap their wings, cars would gallop, and computer vision sensors would only perceive visible light. These people are building solutions rather than solving the problem.