Collected Evidence: Collected Evidence: Primates: Scatter food throughout enclosure Two replicated, before-and-after and one before-and-after study in the USA found that scattering food throughout the enclosure increased feeding and exploratory behaviours in rhesus macaques and reduced abnormal behaviours in chimpanzees and aggression in lemurs. One before-and-after study in the USA found that when food was scattered throughout the enclosure more foraging was seen and activity levels increased in gorillas.  Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1315https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1315Wed, 12 Oct 2016 13:58:47 +0100Collected Evidence: Collected Evidence: Primates: Hide food in containers (including boxes and bags) Two before-and-after studies in the USA and Ireland found that the addition of browse to food in boxes, baskets or tubes increased activity levels and foraging behaviours in lemurs and gibbons. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1316https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1316Wed, 12 Oct 2016 14:28:15 +0100Collected Evidence: Collected Evidence: Primates: Present food in puzzle feeders Two before-and-after studies in the USA and the UK found that the use of puzzle feeders decreased food sharing, increased foraging behaviour, and the use of tools but also aggression. One replicated, before-and-after study in the USA found that the use of puzzle feeders increased time spent feeding and less time inactive.  Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1318https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1318Wed, 12 Oct 2016 14:51:50 +0100Collected Evidence: Collected Evidence: Primates: Present food frozen in ice Two replicated and before-and-after studies in the USA and Ireland, found that when food was presented in ice, feeding time increased and inactivity decreased.  Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1321https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1321Wed, 12 Oct 2016 15:05:37 +0100Collected Evidence: Collected Evidence: Primates: Maximise both horizontal and vertical food presentation locations One controlled study in the UK and Madagascar found that when food was hung in trees in an outdoor enclosure, less time was spent feeding on food in the indoor enclosure. One replicated, before-and-after study in the UK reported that monkeys spent longer feeding in bowls positioned at the top of an enclosure than in bowls positioned on the floor.  Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1328https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1328Thu, 13 Oct 2016 08:22:00 +0100Collected Evidence: Collected Evidence: Primates: Formulate diet to reflect nutritional composition of wild foods (including removal of domestic fruits) One before-and-after study in the USA found that replacing milk with fruit juice in gorilla diets led to a decrease in regurgitation and reingestion. One replicated, before-and-after study in the UK found that when lemurs were fed a fruit-free diet aggression and self-directed behaviour were lower.  Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1329https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1329Thu, 13 Oct 2016 08:27:19 +0100Collected Evidence: Collected Evidence: Primates: Change the number of feeds per day Two before-and-after studies in Japan and the USA found that when the number of feeds per day were increased the amount of time spent feeding increased in chimpanzees, but hair eating also increased in baboons.  Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1337https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1337Thu, 13 Oct 2016 08:44:38 +0100Collected Evidence: Collected Evidence: Primates: Feed individuals in social groups One replicated, controlled study in the USA reported that an enrichment task took less time to complete when monkeys were in social groups than when feeding alone. One before-and-after study in Italy found that in the presence of their groupmates monkeys ate more unfamiliar foods during the first encounter.  Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1343https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1343Thu, 13 Oct 2016 08:56:07 +0100Collected Evidence: Collected Evidence: Amphibians: Identify and breed a similar species to refine husbandry techniques prior to working with target species Two small, replicated interlinked studies in Brazil found that working with a less-threatened surrogate species of frog first to establish husbandry interventions promoted successful breeding of a critically endangered species of frog. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1862https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1862Thu, 18 Jan 2018 16:03:54 +0000Collected Evidence: Collected Evidence: Amphibians: Vary enclosure temperature to simulate seasonal changes in the wild One small, replicated study in Italy found that one of six females bred following a drop in temperature from 20-24 to 17°C, and filling of an egg laying pond. One replicated, before-and-after study in Australia that provided a pre-breeding cooling period, alongside allowing females to gain weight before the breeding period, separating sexes during the non-breeding period, providing mate choice for females and playing recorded mating calls, increased breeding success. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1864https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1864Thu, 18 Jan 2018 16:32:22 +0000Collected Evidence: Collected Evidence: Amphibians: Vary artificial rainfall to simulate seasonal changes in the wild Two replicated, before-and-after studies in Germany and Austria found that simulating a wet and dry season, as well as being moved to an enclosure with more egg laying sites and flowing water in Austria, stimulated breeding and egg deposition. In Germany, no toadlets survived past 142 days old. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1872https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1872Fri, 19 Jan 2018 10:13:30 +0000Collected Evidence: Collected Evidence: Amphibians: Provide multiple egg laying sites within an enclosure One replicated study in Australia found that frogs only bred once moved into an indoor enclosure which had various types of organic substrate, allowed temporary flooding, and enabled sex ratios to be manipulated along with playing recorded mating calls. One small, replicated, before-and-after study in Fiji found that adding rotting logs and hollow bamboo pipes to an enclosure, as well as a variety of substrates, promoted egg laying in frogs. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1873https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1873Fri, 19 Jan 2018 10:21:58 +0000Collected Evidence: Collected Evidence: Amphibians: Provide natural substrate for species which do not breed in water (e.g. burrowing/tunnel breeders) Two replicated studies in Australia and Fiji found that adding a variety of substrates to an enclosure, as well as rotting logs and hollow bamboo pipes in one case, promoted egg laying in frogs. The Australian study also temporarily flooded enclosures, manipulated sex ratios and played recorded mating calls. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1874https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1874Fri, 19 Jan 2018 10:30:30 +0000Collected Evidence: Collected Evidence: Amphibians: Manipulate temperature of enclosure to improve development or survival to adulthood One replicated study in Spain found that salamander larvae had higher survival rates when reared at lower temperatures. One replicated study in Germany found that the growth rate and development stage reached by harlequin toad tadpoles was faster at a higher constant temperature rather than a lower and varied water temperature. One replicated study in Australia found that frog tadpoles took longer to reach metamorphosis when reared at lower temperatures. One replicated, controlled study in Iran found that developing eggs reared within a temperature range of 12-25°C had higher survival rates, higher growth rates and lower abnormalities than those raised outside of that range. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1893https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1893Fri, 19 Jan 2018 15:02:07 +0000Collected Evidence: Collected Evidence: Amphibians: Use hormone treatment to induce sperm and egg releaseFor summarised evidence see Smith, R.K. and Sutherland, W.J. (2014) Amphibian conservation: Global evidence for the effects of interventions. Exeter, Pelagic Publishing.   Key messages and summaries are available here: http://www.www.conservationevidence.com/actions/883Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1896https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1896Fri, 19 Jan 2018 15:08:37 +0000Collected Evidence: Collected Evidence: Amphibians: Use artificial fertilization in captive breedingFor summarised evidence see Smith, R.K. and Sutherland, W.J. (2014) Amphibian conservation: Global evidence for the effects of interventions. Exeter, Pelagic Publishing.   Key messages and summaries are available here: http://www.www.conservationevidence.com/actions/834Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1897https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1897Fri, 19 Jan 2018 15:09:55 +0000Collected Evidence: Collected Evidence: Amphibians: Freeze sperm or eggs for future useFor summarised evidence see Smith, R.K. and Sutherland, W.J. (2014) Amphibian conservation: Global evidence for the effects of interventions. Exeter, Pelagic Publishing.   Key messages and summaries are available here: http://www.www.conservationevidence.com/actions/876Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1899https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1899Fri, 19 Jan 2018 15:11:58 +0000Collected Evidence: Collected Evidence: Carnivores: Feed commercially prepared diets One replicated, before-and-after study in the USA found that providing a commercial diet to maned wolves led to similar dry matter intake and digestibility despite having a lower protein content. One replicated, randomized study of African wildcats in the USA found that feeding a commercial diet decreased crude protein digestibility and increased food intake and faecal output compared to raw meat. One controlled study of African wildcats in the USA found lower organic matter digestibility compared to a ground-chicken diet. One replicated, controlled study in South Africa found that cheetahs fed a commercial diet had a similar likelihood of developing gastritis as those fed horse meat, lower levels of blood protein urea but higher levels of creatine. One study in USA found that cheetahs fed a commercial meat diet or whole chicken carcasses had plasma a-tocopherol, retinol and taurine concentrations within the ranges recommended for domestic cats. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1900https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1900Wed, 24 Jan 2018 09:26:14 +0000Collected Evidence: Collected Evidence: Carnivores: Feed whole carcasses (with or without organs/gastrointestinal tract) Two replicated, before-and-after studies in the USA found that feeding whole carcasses reduced pacing levels in lions, leopards, snow leopards and cougars. However, it increased pacing in tigers. One replicated, randomized, controlled study in Denmark found that when fed whole rabbit, cheetahs had lower blood protein urea, zinc and vitamin A levels compared to supplemented beef. One replicated before-and-after study in Denmark found that feeding whole rabbit showed lower levels of inflammatory bowel indicators in cheetahs. One replicated, randomized study and one controlled study in the USA found that when fed whole 1 to 3 day old chickens, ocelots had lower digestible energy and fat compared to a commercial diet and African wildcats had had lower organic matter digestibility compared to a ground-chicken diet. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1901https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1901Wed, 24 Jan 2018 09:52:15 +0000Collected Evidence: Collected Evidence: Carnivores: Provide bones, hides or partial carcasses One replicated, before-and-after study in the USA and one replicated, controlled study in Finland found that the provision of bones decreased the frequency of stereotypic behaviours in lions, tigers and Arctic foxes. Two replicated, before-and-after studies of felids and red foxes in the USA and Norway found that the provision of bones increased activity and manipulation time. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1902https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1902Wed, 24 Jan 2018 10:01:34 +0000Collected Evidence: Collected Evidence: Carnivores: Provide food on a random temporal schedule Three replicated, before-and-after studies in Switzerland, Ireland and Canada, UK, Ireland, Namibia and South Africa and one replicated, controlled study in Ireland found that an unpredictable feeding schedule reduced the frequency of stereotypic pacing behaviours in tigers and cheetahs. One replicated, before-and-after controlled study in the USA found that an unpredictable feeding schedule increased territorial behaviour in coyotes but did not affect travelling or foraging. Two before-and-after studies in Switzerland and the USA found that an unpredictable feeding schedule increased behavioural diversity in red foxes and alertness in a black-footed cat. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1904https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1904Wed, 24 Jan 2018 10:20:46 +0000Collected Evidence: Collected Evidence: Carnivores: Hide food around enclosure Four replicated, before-and-after studies in the USA, UK and Germany and one before-and-after study of a black bear, leopard cats, bush dogs, maned wolves and Malayan sun bears found that hiding food increased exploring and foraging behaviours. One replicated, before-and-after study and one before-and-after study in the USA found a decrease in stereotypical pacing in leopard cats and black bear. One before-and-after study in the USA found that hiding food reduced the time Canadian lynx spent sleeping during the day. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1915https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1915Wed, 24 Jan 2018 10:47:53 +0000Collected Evidence: Collected Evidence: Carnivores: Present food frozen in ice Two replicated, before-and-after studies in the USA found that when presented with food frozen in ice, abnormal or stereotypic behaviours decreased and activity levels increased in bears and felids. One replicated, before-and-after study in the USA found that manipulation behaviours increased in lions, whereas a replicated study in the USA found that manipulation behaviours decreased in grizzly bears. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1923https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1923Wed, 24 Jan 2018 11:51:02 +0000Collected Evidence: Collected Evidence: Carnivores: Present food inside objects (e.g. Boomer balls) Two before-and-after studies in Germany and India found that exploratory and foraging behaviours increased and stereotypic behaviours decreased in sloth bears and spectacled bears when presented with food inside objects. One before-and-after study in the USA found that exploring/foraging behaviours decreased in a sloth bear when presented with food inside objects. One replicated study in the USA found that grizzly bears spent a similar time manipulating food in a box and freely available food. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1924https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1924Wed, 24 Jan 2018 12:13:36 +0000Collected Evidence: Collected Evidence: Carnivores: Provide devices to simulate live prey, including sounds, lures, pulleys and bungees Two before-and-after studies in the USA and the UK found that activity levels and behavioural diversity increased in felids when presented with a lure or pulley system. One replicated, before-and-after study in the USA found that pacing behaviour decreased and walking increased in cougars, but pacing initially increased in tigers, when provided with a carcass on a bungee. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1927https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1927Wed, 24 Jan 2018 12:29:30 +0000
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 21

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape ProgrammeRed List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Mauritian Wildlife Supporting Conservation Leaders
Sustainability Dashboard National Biodiversity Network Frog Life The international journey of Conservation - Oryx Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered species Vincet Wildlife Trust