capturing & handling part - i advanced lec 02 wildlife techniques university of rio grande...
TRANSCRIPT
Capturing & Handling
Part - I
ADVANCED LEC
02WILDLIFE TECHNIQUES University of Rio Grande Donald P. Althoff, Ph.D.
CAPTURING BIRDS: BAITED TRAPS
• Raptors—attract with “live” bait (pigeons, doves, mice, rats). This is decoy approach. One example is the bal-chatri design (TM:248).
• Pigeons/Doves/Quail *—attract with seeds (sometimes colored). Attraction based on “sight” attractant (vs. “odor” attractant which is typical of mammal bait trapping). Walk-in traps are common.
• Wild Turkey/Shorebirds –cannon nets…bait with corn/grain. Multiple captures possible.
*generally low-risk of injury/death to bird(s)
BAL-CHATRI designs
WALK-IN TRAPSMultiple captures
possible
ROCKET / CANNON PROPELLED NETS—
_________ captures expected
Take advantage of ____________ behavior
CAPTURING BIRDS: UNBAITED TRAPS/TRAPPING
• Songbirds—mist nets. Sometimes use both “_______” and “sound” (think song).
• Geese/Ducks—drop nets or drive into cage/fence/corral. Key: birds are ____________. May use bait, but typical to herd birds under the net.
CANADA GOOSE in flightless condition
(i.e., molt)
CAPTURING BIRDS: SPOTLIGHTING
• Upland Gamebirds (pheasants, prairie chickens, sharp-tailed grouse)—netting off of front bumper of vehicle at night or walking
• Woodcock—netting birds (males) that are peenting (during spring breeding)
Take advantage of “_______________”
behavior
CAPTURING MAMMALS: BAITED TRAPS/TRAPPING
• Rabbits/Rodents/etc.—conventional “treadle” cage/box traps
• Bears—culvert traps. “Round” box traps.
• Foxes, Coyotes, Bobcats, etc.—cage baited traps
• Foxes, Coyotes, Bobcats, etc.—leg hold traps (usually baited but “blind set” sometimes works
• Conventional wooden rabbit trap “features”
__________ “activated”__________ guard—front door“see through” back:
a) __________________ through for rabbitb) tech can see “in”
Wooden sides & top reduces ___________ (both
weather and predators)
BEARCulvert trap designs
Custom vs Stock
Why round design?
CAPTURING MAMMALS: BAITED TRAPS/TRAPPING
• Deer—drop nets, drive nets
• Feral pigs/jack rabbits—corral “traps”
CAPTURING MAMMALS: Corral Traps
• Deer/Bison• Jackrabbits
CAPTURING MAMMALS: LEG-HOLD TRAPS
• Carnivores—attract by bait, urine/scent, or “blind” sets
• Much improvement in design last 20+ years to reduce foot injuries –yet still risk
• ______________ (double-to left; single long-spring common)
• ______________
• Padded jaws
• Offset jaws
Safety Improvements
CAPTURING MAMMALS: Helicopter Capture
• Deer/Elk/Moosemisc. ungulates
• Coyotes
CAPTURING MAMMALS: Helicopter Capture
• Pros -quick ; “shortened” trapping/capture days -focused area
-no baiting/on-the-ground trapping over days
• Cons -expensive -must be “for hire” / contracted out -risk to flight crew -limited often by terrain/topography/landscape
In summary…
• Think about _____________ of animal
• Consider ways to “_______________” the animal
• ________________________
• Always think about building “___________________”