Navigating Beetles

How a beetle can use the stars to navigate its way across the vast deserts of  Africa

It might look small and insignificant but the  dung beetle has its sights set firmly on the stars.

The beetle is the first insect proven to use  the light of the Milky Way to help steer its course.

Also known as the scarab, the tiny creatures  feed on animal droppings, which they fashion into a ball and roll away to a safe  spot where it is less likely to be stolen.

Expert navigator: New research has found that scarabs - also known as dung beetles - find their way through their desert habitat by using the stars of the Milky Way as a reference
 New research has found that scarabs –  also known as dung beetles – find their way through their desert habitat by  using the stars of the Milky Way as a reference

Although their eyes are too weak to  distinguish individual constellations, scientists found they used the  glow of  the Milky Way to navigate in a straight line, ensuring they do  not circle back  to the dung-heap and potential competitors.

‘Even on clear, moonless nights, many dung  beetles still manage to orientate along straight paths,’ said Dr Marie Dacke  from Lund University in Sweden.

‘This led us to suspect that the beetles  exploit the starry sky for orientation – a feat that had, to our knowledge,  never before been demonstrated in an insect.’

Field experiments on a South African game  reserve showed that the beetles were able to roll their dung balls along  straight paths under starlit skies, but not in overcast conditions.

The lighter band of the Milky Way's edge: While unable to pick out constellations, the scarabs could detect the light arcing over their heads
The lighter band of the Milky Way’s edge: While unable  to pick out constellations, the scarabs could detect the light arcing over their  heads

For the tests, the beetles were fitted with  tiny cardboard caps to alter their field of vision.

They were placed in a circular arena  surrounded by a meter-high black cloth, making it impossible for them to see  landmarks.

With no moon, it took much less time for the  beetles to roll a dung ball from the center of the arena to the edge when they  were able to see the sky.

When they could not look up, the time taken  increased from 40 seconds to 124 as they wandered aimlessly around.

The experiment was repeated in a Johannesburg  planetarium, with similar results.

The beetles performed equally well under a  full sky of stars, and when only the glow of the Milky Way was  visible.

Most stars would be too dim for the beetles’ tiny compound eyes to see, said the researchers. While unable to pick out  constellations, the scarabs  could detect the light of the Milky Way arcing over  their heads.

‘This finding represents the first convincing  demonstration for the use of  the starry sky for orientation in insects and  provides the first  documented use of the Milky Way for orientation in the  animal kingdom,’  the researchers wrote in the journal Current  Biology.

Previously only birds, seals and humans were  known to navigate by the stars.

Dung beetles also use the sun and moon as  compass cues, said the scientists.

They added: ‘Although this is the first  description of an insect using the  Milky Way for their orientation, this  ability might turn out to be  widespread in the animal kingdom.’

Attribution: Damien Gayle, Mail Online

 

Your Keys are Hot!

If you’re a regular reader, you know I don’t write about or publish anything having to do with computers or tech, other than something new or what I think is cool. I came across this and decided I can’t be the only dope out there that doesn’t know this stuff. Below is a list of common keyboard hotkeys or shortcuts, broken out into categories.  They will work with virtually any web browser.

Basic Navigation Hotkeys

Keyboard Shortcut Action
F5 Refresh
Ctrl + F5 Refresh and reset the browser cache for the current page.
Alt + Left Arrow Back
Alt + Right Arrow Forward
Alt + Home Return to Homepage
Escape Stop
F6 Select the address bar (Alt+D and Ctrl+L also works here)
F11 Fullscreen mode, exit fullscreen mode
Home Scroll to top of page
End Scroll to bottom of page
Spacebar Scroll down
Shift+ Spacebar Scroll up
Page Down / Up Scroll down / up
Ctrl + C Copy selected text
Ctrl + X Cut (copy and delete original) text
Ctrl + V Paste copied text

 

Advanced Navigation Shortcut Keys

Keyboard Shortcut Action
Ctrl + D Bookmark current page
F1 Open a mostly useless help page
F3 Perform a text search on the current page, find next text result
Shift + F3 Find previous text search results
Ctrl + F Perform a text search on the current page
Ctrl + G Find next text result
Ctrl + Shift + G Find previous text result
Ctrl + H Open browsing history
Ctrl + J Open downloads folder and/or history
Ctrl + O Open a local file in the browser
Ctrl + S Download and save current page
Ctrl + P Print current page
Ctrl + E Select the search box or omnibar. (Ctrl + K also works)
Ctrl + Shift + Del Opens up the clear browser history dialog or settings
Alt + Enter Open search in a new tab
Ctrl + Enter Open search term as a website
F12 Open developer tools or Firebug
Ctrl + U View source
Alt + F Makes the menu bar appear (if hidden)

All About Tabs

Keyboard Shortcut Action
Ctrl + N Opens a new window (this works in Windows too)
Ctrl + Tab Cycle forward to the next tab
Ctrl + Shift + Tab Cycle backward to the previous tab
Ctrl + F4 Closes the current tab.
Ctrl + T Opens a new tab.
Ctrl + Shift + T Opens a recently closed tab.
Alt + F4 Close the entire window (truly universal for every app)
Ctrl + # key (1 to 8) Changes view to the tab number chosen
Ctrl + 9 Changes view to the last tab 

Mouse and Keyboard Combos

Keyboard Shortcut Action
Ctrl + Mousewheel Zoom in our out
Ctrl + 0 Reset to 100% (default) zoom
Mousewheel Press Closes tabs if clicked on a tab, opens links in new tab, scroll
Ctrl + Left Click Open link in a new tab
Shift + Left click Open link in a new window
Shift + Ctrl + Left click Open link in a new background tab

Attribution: Groovy Post