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left arrowarrow leftTable III a  -  Page 4
University of Toronto at Mississauga, Mississauga, Ontario;  September 12, 1998;
Co-ordinates = 4333'N, 7940'W;  Altitude = 152 m;  
Magnetic Declination = 10W (Subtract 10 for True);  Magnetic Inclination = 72.30;  
Observer:  David Gibo
Num.    Species    Time Flight Behaviour Weather Field Notes
I     II     III IV Va Vb Part 1 Part 2 Part 3
Est.
 Alt.
  
Type
of Flt.
Horiz.
Path
Vert.
Path
Mag.
Bear.
Mag.
Head.
Wind
Dir.
 Wind 
Vel.
Amb.
Temp.
Thrm.
Act.
Cloud 
Types 
Start - 2:25 - - - - - - calm - 27.0C yes 100%
strato-
cumulus
Observations were made in a parking lot north of the South Building . Winds aloft were N.  thermal activity was indicated by variable breezes.  A huge migration of Anax junius was in progress.
1

Anax junius

2:28 200 m flap straight level 298 - calm - 27.0C yes 100%
strato-
cumulus

Dragonfly flew straight except for episodes of several seconds when it deviated from its track  (usually climbed) to capture a  prey item.  The air was full of small insects.

2 A, junius 2:31 200 m flap straight
forage
level
forage
280 right calm - 27.0C - 100%
strato-
cumulus

Dragonfly flight behaviour was as above.  At least 6 more were seen in my field of vision, some much higher.  None are visible to unaided vision.

3

A, junius

2:36 200 m flap straight
forage
level
forage
308 - calm - 27.0C no 100%
strato-
cumulus
Flight behaviour was as above.  Gulls were flapping.   Binoculars were necessary to see the migration.

4

Danaus plexippus

2:42 200 m soar straight
variable
level 234 right calm - 27.0C yes 100%
strato-
cumulus
Butterfly frequently made small half turns and other minor adjustments of its flight path - perhaps searching for stronger lift.  An A. juinius was also seen.

Descriptive Circular Statistics