Waterside patterns


Consider this: laryngeal air sac as 'air trap'
(from my post at AAT)*

Macaque + Nasalis + Otter (air trap in underfur)

Longest tail = smallest air trap/sac = no float, fast swim
long tail proboscis, long tail macaque, long tail river otter

Shortest tail = largest air trap/sac = float, slow swim
pig tail nasalis, stump tail macaque, sea otter, ape, sloth
(Also walrus w/ pharyngeal air sac*)

Then reduction of air sac & fur in Homo and change:
from vert. float (head above, fear inflates sac)
to diagonal float (nose above, lungs/fat, dip face, sac vs nose)
to horiz. back float (mouth above, pachy., Photic sneeze, dive)
to horiz. boat float (body in any position, feet on "dry ground")
boat/float/basket/netbag/harpoon/net/mollusk rake and forced expansion
to food-rich waters which are hazardous to dive (crocs, sharks,
hippos, cold, high surf)

Good fit? With each phase, technology + biological adaptation improved
together.

DD

[* edited since AAT post]

I should add, I doubt LCA HP dipped or swam underwater.
Deer have air sacs and short tail, although they don't generally just
float, to avoid mass swarms of mosquitoes and black flies they get in
water or snowfields. DD
.

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