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can_one-legged_corvids_be_released [2026/06/03 19:02] – created administratorcan_one-legged_corvids_be_released [2026/06/05 18:31] (current) – administrator
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 ===== Introduction ===== ===== Introduction =====
  
-The most common causes in the wild for birds loosing a leg is entanglement with thread, fishing line, balloon ribbons or other litter. This can happen at all ages, even as a nestling. Other causes include predator attacks, birth deformities or injuries caused by traps and snares.+{{ :laniakea.jpeg?200|}}The most common causes in the wild for birds loosing a leg is entanglement with thread, fishing line, balloon ribbons or other litter. This can happen at all ages, even as a nestling. Other causes include predator attacks, birth deformities or injuries caused by traps and snares.
  
 ===== Injuries in the Wild ===== ===== Injuries in the Wild =====
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 Unlike in the wild, in captivity it is possible to counteract most of these potential problems by adapting aviaries and enclosures accordingly. Perches can be replaced with flat padded wooden boards, which allow the bird to sit and rest comfortably and also help to avoid the precious plumage being damaged or soiled. Roosting platforms can be carpeted with non-slip thick artificial grass mats, which can be easily replaced and hosed down daily. Physically impaired birds in captivity need to be monitored very closely, and a weekly bath with lukewarm water may become part of a normal routine, as these birds sometimes may struggle to preen themselves efficiently, in particular when getting older. Access to food and water can be easily guaranteed in captivity, as competition with other inmates can be avoided by providing ample food and feeding opportunities in different areas of the aviary. Keeping captive birds in groups also means that relationships between birds can be easily observed, bearing in mind that these relationships are never static but rather dynamic, as they would be in the wild too. Bonds and friendships may change during the lives of these birds. When keeping physically impaired birds, and despite optimal aviary preparation and design, there is always an increased risk and increased likelihood that foot and joint deformities as well as pressures sores may develop, which need to be avoided at all cost and do require frequent checks and health assessments. Unlike in the wild, in captivity it is possible to counteract most of these potential problems by adapting aviaries and enclosures accordingly. Perches can be replaced with flat padded wooden boards, which allow the bird to sit and rest comfortably and also help to avoid the precious plumage being damaged or soiled. Roosting platforms can be carpeted with non-slip thick artificial grass mats, which can be easily replaced and hosed down daily. Physically impaired birds in captivity need to be monitored very closely, and a weekly bath with lukewarm water may become part of a normal routine, as these birds sometimes may struggle to preen themselves efficiently, in particular when getting older. Access to food and water can be easily guaranteed in captivity, as competition with other inmates can be avoided by providing ample food and feeding opportunities in different areas of the aviary. Keeping captive birds in groups also means that relationships between birds can be easily observed, bearing in mind that these relationships are never static but rather dynamic, as they would be in the wild too. Bonds and friendships may change during the lives of these birds. When keeping physically impaired birds, and despite optimal aviary preparation and design, there is always an increased risk and increased likelihood that foot and joint deformities as well as pressures sores may develop, which need to be avoided at all cost and do require frequent checks and health assessments.
  
-===== Are One-legged Corvids Releasable? =====+===== Conclusions =====
  
 So, how would a rescue corvid with leg or foot amputation cope in the wild? Due to their life style and ability to adapt, corvids would have an advantage as omnivores. They would be able to adapt to a certain degree, but would very likely stay in the soft release area and would therefore continue to rely on support feeding. Territorial corvid species such as magpies and carrion crows would have great difficulties to find a partner and to successfully occupy and defend a breeding territory. They would also have to fight very hard for a favourable social position in non-breeding flocks, if they would attempt to join. Gregarious rooks may have an advantage in this respect. However, as rooks obtain most of their food by probing the ground, physically impaired birds may struggle to do so, especially in those areas where winter feeding is difficult or impossible due the ground being frozen, which will require that these birds would have to migrate. Generally seen, roosting may also pose a problem on a daily basis, as these birds will have some problems to perch properly. So, how would a rescue corvid with leg or foot amputation cope in the wild? Due to their life style and ability to adapt, corvids would have an advantage as omnivores. They would be able to adapt to a certain degree, but would very likely stay in the soft release area and would therefore continue to rely on support feeding. Territorial corvid species such as magpies and carrion crows would have great difficulties to find a partner and to successfully occupy and defend a breeding territory. They would also have to fight very hard for a favourable social position in non-breeding flocks, if they would attempt to join. Gregarious rooks may have an advantage in this respect. However, as rooks obtain most of their food by probing the ground, physically impaired birds may struggle to do so, especially in those areas where winter feeding is difficult or impossible due the ground being frozen, which will require that these birds would have to migrate. Generally seen, roosting may also pose a problem on a daily basis, as these birds will have some problems to perch properly.
  
 Prior to any release animals should be considered fully fit and able to fend for themselves in the wild. Fitness assessment should consider clinical, behavioural and physical assessments such as weight, body condition score and the ability to fly or run etc. A release should not be carried out if animals are deemed significantly less likely to thrive in the wild than a conspecific. All in all survival chances of one-legged corvids will not be very good, in particular not in the long-term. Their life expectancy will be far lower compared to their two-legged counterparts. On balance we would not recommend the release of one-legged corvids, especially not when considering the fact that one-legged birds are by definition not in full health and have therefore a limited physical ability, compared to their wild counterparts. From an ethical standpoint, it could be regarded as cruel, whilst from a legal point of view it would most likely be regarded as illegal to release a bird, who has a low chance of survival in the wild compared with his or her conspecifics. Prior to any release animals should be considered fully fit and able to fend for themselves in the wild. Fitness assessment should consider clinical, behavioural and physical assessments such as weight, body condition score and the ability to fly or run etc. A release should not be carried out if animals are deemed significantly less likely to thrive in the wild than a conspecific. All in all survival chances of one-legged corvids will not be very good, in particular not in the long-term. Their life expectancy will be far lower compared to their two-legged counterparts. On balance we would not recommend the release of one-legged corvids, especially not when considering the fact that one-legged birds are by definition not in full health and have therefore a limited physical ability, compared to their wild counterparts. From an ethical standpoint, it could be regarded as cruel, whilst from a legal point of view it would most likely be regarded as illegal to release a bird, who has a low chance of survival in the wild compared with his or her conspecifics.
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