Silver ant hair
- In the Sahara, Cataglyphis bombycina, the silver ant is the most heat-tolerant creatures known
- Feed on corpses of insects and other arthropods that have died to the thermally harsh desert conditions, which they themselves are able to withstand more successfully
- They can forage in the Saharan Desert in the full midday sun when surface temperatures reach up to 70°C (158°F), and they must keep their body temperature below their critical thermal maximum of 53.6°C (128.48°F) most of the time 
What is its secret ?
- Saharan silver ants, where covered with dense array of uniquely shaped triangular hairs with two thermo-regulatory effects.
- Hair characteristic for (Cataglyphis bombycina), enables the ants to maintain lower body temperatures by:
Reflecting a large portion of the solar radiation in the visible and near infrared(NIR) range of the spectrum,
- Radiating heat to the surrounding environment by enhancing the emissivity in the mid-infrared (MIR)
- By using the electron microscope (fig 3,4) to examine the hairs we find that it had
- triangular shape and end in a sharp point:
- The two upper sides of the triangular shape are corrugated (have grooves)increasing the surface area facing skywards.
- the base is flat enhancing reflection.
- hairs shows that they all adopt the same orientation, with their flat side parallel to each other and to the surface.
in visible and near-infrared light spectrum
total internal reflection of incident light, corrugated sheets act as anti glare.
med – infrared light spectrum
hair arrangement act as a Protective anti reflection layer
Factors affecting system
- Cross section 
triangular hairs are much better at higher angles of incidence ( 40 -60 ) as the presence of bottom facet ( flat surface ) enhances reflection further.
- Angle of incidence
Maximum reflectivity of angles range from 30- 75 degrees
At angles approaching 90°, reflectivity drops off when total internal reflection at one of the top facets starts to direct more of the radiation toward the ant’s body
3.Gap size 
Reactivity in the visible and near infrared (NIR) increases as the gap opens up.
hair arrangement play a crucial role in the efficiency of the system (as all hairs act as a group (prisms) units reflecting electromagnetic waves to block the heating )
Possible technique ( digital model )
- Swarming intelligence : as a way to organize the hair arrangement to acquire optimum sun light
Project mind map ( final conclusion)
 Keeping cool: Enhanced optical reflection and heat dissipation in silver ants
(Norman Nan Shi,1 Cheng-Chia Tsai,1 Fernando Camino,2 Gary D.Bernard,3 Nanfang Yu,1* Rüdiger Wehner4* ) Department of Applied Physics and Applied Mathematics, Columbia University, New York, USA