| Summary Information |
| Type of
technique |
Health
& Management / UK
Wildlife Casualty Management / Techniques: |
| Synonyms and
Keywords |
N.B. This
information should be read in association with Wildlife Casualty Handling and
Transport which contains background information together with links to
the Electronic Library and Organisations (UK Contacts). The related Species pages contain
similar linkages. |
| Description |
- Study the situation and assess the following factors:
- Confined space or risk of escape?
- Size and strength of the animal to be caught.
- Long legs (which may be injured during catching)?
- Degree of mobility of animal to be caught (speed of movement, ability to fly, climb or
jump).
- Pattern of movement (particularly in a confined space where movement patterns will be
repeated): e.g. the same perches being used in each circuit, the same points where
direction changes etc. - these may be useful guides for likely capture points.
- In a semi-confined space, likely escape routes the animal may head towards: these need
to be blocked or can be used as a site for netting (see point (2) below).
- Hazards to be avoided (e.g. low beams, furniture, branches, logs, bushes, ponds etc.)
- Choose a net of appropriate size, handle length and net characteristics (mesh size and
cord thickness, or opaque material weight/strength).
- Decide on an appropriate strategy and, if more than one person is involved in the
capture, make sure each person knows what they are to do (e.g. net the animal, herd the
animal towards the catcher, control the animal once in the net.)
- Ensure any container for the animal is ready with its lid/door open.
Techniques for capture include the following:
1) Method suitable for catching an animal
against a solid surface: bringing a net directly down over the animal on the ground, wall,
fence or other surface, so that it is trapped between the net and the surface.
- Hold the net firmly in place with the rim on the ground or
surface.
- Have a second person control the animal through the net.
- Once the animal is under control, loosen the hold on the net allowing the rim to leave
the ground/surface, then:
a) Disentangle the animal from the net, if necessary, with care and place in a
suitable carrying container.
OR
b) Manoeuvre into a suitable carrying container, close the lid/door as far as possible,
let go of the animal while keeping the lid down/door closed, pull the net out and fully
close the lid/door.
2) Method suitable for catching an animal in an area
with only one escape route, in which the catcher can be positioned (preferably hidden)
along the only apparent escape route), or when an animal is repeating a particular pattern
of movements within a confined space.
- If necessary, have an assistant(s) encourage the movement of the animal towards the
catcher (person holding the net).
- Swoop the net down directly in front of the running/jumping/flying animal such that it
propels itself into the net.
- Immediately either
a) flatten the rim of the net to the ground, as above and proceed
OR
b) twist the handle of the net by 90° or more so that the animal is enclosed within
the bag of the net and the exit is blocked.
THEN:
a) Control the animal by hand through the net (often requires a second person). Once
the animal is under control the net may be untwisted, then:
- Disentangle the animal from the net, if necessary, with care and place in a
suitable carrying container
or:
- Keeping control of the animal and without taking it out of the net, manoeuvre the net
and animal into a suitable carrying container, close the lid/door as far as possible, let
go of the animal while keeping the lid down/door closed, pull the net out the smallest
possible gap and fully close the lid/door.
OR
b) the animal may be transferred directly from the net to an appropriate container with
minimal handling (not appropriate if the animal may be tangled within the net or
where risk from escape of the animal is high, but may be less stressful for the animal),
either:
- the net is manoeuvred quickly into an appropriate container for the
animal, the lid/door of the container is closed except for the small gap left for the net
handle, the net is then untwisted, the animal allowed to move out of the net, the net is
pulled out and the lid/door closed fully
or
- the net is positioned with the rim against the opening of the container, the free end of
the net (containing the animal) is grasped and moved so that the exit from the net is no
longer blocked, the animal is allowed to move from the net into the container, the
lid/door is closed onto the net, the net is pulled out the last opening and the lid/door
fully closed.
3) Two-net approach method suitable for an
animal in the open, with only one chance for capture.
- Position two people with nets, one on either side of the animal (or for one person, a
net in each hand may be possible), then:
a) The first person swoops with his/her net and may capture the animal.
OR
b) As the animal flees away from the first net, the second net is moved so that its
escape takes it straight into the second net. Then block the exit from the net by twisting
the handle as above.
OR
c) (e.g. if the animal is not sufficiently far inside either net) Bring the rims of the
two nets together and hold together until a position is reached such that the captured
animal is properly within one net and the exit may be blocked in the usual manner.
4) Method for catching a bird on water.
- Slide the net into the water from land or from a boat and
bring the net up under the bird, lifting it clear of the water and twisting the rim to
block escape.
- This method is not often practical.
Additional notes:
- If a net of opaque material is used, it is important to identify the orientation of the
animal within the net before attempting to control it. Gentle poking with a stick
(NOT a finger) will usually elicit a response identifying the position of the head.
- If a mesh net is used the animal must be disentangled from the net WITH CARE,
particularly for long-legged animals. First the animal must be under control, then the
limbs and/or digits should be removed from the net, one limb/digit at a time, keeping the
animals head and limbs under control at all times. Covering the eyes of the animal may
keep it quieter while this is being accomplished.
|
| Appropriate Use (?) |
- For a wide variety of species.
- Most useful in confined or semi-confined situations.
- May be used by a single person (depending on circumstances).
- Assistance by a second person is preferable in many circumstances.
|
| Notes |
- If a net of opaque material is used, it is important to identify the orientation of the
animal within the net before attempting to control it. Gentle poking with a stick
(NOT a finger) will usually elicit a response identifying the position of the head.
- If a mesh net is used the animal must be disentangled from the net WITH CARE,
particularly for long-legged animals. First the animal must be under control, then the
limbs and/or digits should be removed from the net, one limb/digit at a time, keeping the
animals head and limbs under control at all times. Covering the eyes of the animal may
keep it quieter while this is being accomplished.
- If possible, a range of nets should be available, including nets with adjustable-length
handles, so that a net can be used which is appropriate for the size and strength of the
animal being caught.
- Small species should be caught with a net with a small mesh size/cord thickness, or
using a net of lightweight opaque material.
- Large, strong species require a mesh constructed from thicker cord, usually with a
larger mesh size.
- Nets may be home-made by removing the strings from an old tennis racket and wiring a
strong hessian or jute sack into place on the rim. (D26)
- The bag of a net should be sufficiently long than, once an animal has entered, turning
the rim by 90° closes the net with the animal held inside the hanging bag of the net.
- Proficiency at capturing using a net increases with practice.
- Prolonged chasing of an animal around an area using a net should be avoided.
- Where two or more people are involved, teamwork is essential.
|
| Complications/ Limitations / Risk |
- Chasing with a net is likely to cause a degree of stress to the animal being caught.
- An animal may become highly stressed if chased with a net for a prolonged period.
- Not useful for very large and strong species such as large deer.
- Limited use for highly mobile species in a large area.
- Risk of damage, particularly to small animals, from pinning between the rim and a solid
surface (risk decreased by using a net with a padded rim).
- Risk of an animal injuring itself (including risk of broken limbs and capture myopathy)
if it is allowed to struggle against the net (decreased by choosing the right mesh
size/fabric for the species).
- Risk of birds of prey puncturing their own feet with their talons while being
disentangled from the net.
- Risk of injury from the animal to the person removing it from the net. This includes
bites, kicks, scratches, talon punctures etc.
- Risk of escape of the animal if the net is of the wrong mesh size or material of
insufficient strength for the animal being caught.
- Risk of escape after capture if the net is incorrectly used. Most commonly, not keeping
the rim of the net against a solid surface until the animal is fully in control, or not
twisting the rim of the net sufficiently to block the animals escape from the net.
- Depending on species and circumstances often a second person is required to control the
netted animal after capture.
|
| Equipment / Chemicals required and Suppliers |
Specialist suppliers provide catching equipment
and will sometimes build to order. One example of a Specialist Equipment Suppler is: MDC
Exports Ltd, Unit 11, Titon Court, Laporte Way, Luton BEDS, LU4 8EF.
Hand held nets are available in a wide variety of
sizes and with different handle lengths.
Nets may have a padded or unpadded rim
Nets may be made of mesh of various weights and sizes
Nets may be made of opaque material of various
thicknesses.
Nets may be purchased from e.g. avicultural suppliers and some pet
shops.
|
| Expertise level / Ease of Use |
- May be used by anyone, but proficiency increases with experience.
- Large heavy nets and nets on long poles require more practice for efficient use.
- The catching of difficult species i.e. fragile/long legged and particularly
strong/aggressive species with a net, should be performed by someone with previous
experience.
- Agility, speed and the ability to anticipate the movements of the animal concerned are
important to minimise risk and maximise efficiency of net capture.
|
| Cost/ Availability |
- Cost varies greatly.
- Nets may be home-made.
|
| Legal and Ethical Considerations |
- The animal being caught may be seriously injured if a net is used inappropriately,
particularly with fragile species. This includes very small species and long-legged
species such as deer and many wading birds.
- People catching the animal may be injured if insufficient care is taken during the
capture process.
|
| Author |
Debra Bourne (V.w5) |
| Referee |
Suzanne Boardman (V.w6),
Becki Lawson (V.w26),
Dr Virginia Pierce (V.w73) |
| References |
J3.147.w1,
V.w5,
V.w6,
D26 |