California Spotted Owl

From 1999 to 2000, the population of U.l.catalinae declined drastically to approximately 28 individuals from the original 1342 individuals in 1990 (King 2014). As the result, USFWS officially warranted the listing of this species as Endangered under the Endangered Species Act on March 5, 2004 (USFWS 2004). Due to extensive effort to control disease outbreak, vaccination, captive breeding, translocation/ reintroduction as well as

The tawny owls are evolving in response to climate change. In the past, our winter season it used to be longer, and the predominant colour was gray, but this has change gradually to the point that they grey is almost extinguish. The shorter winter and the highest temperature have cause that gradually the feather of the tawny owl turns brown.

Found in grasslands or open country for foraging, and nest in tall, dense trees or shrubs. Long-eared Owls are nocturnal and spend their day sleeping in trees. They hunt at night by using eyesight and hearing to catch prey.

In Reference 3, Louisa Wilcox (Natural Resources Defense Council Member) talks about how grateful she is to the Endangered Species Act for allowing grizzly bears to strive in the Yellowstone National Park. She reported, “After listing, the government cleaned up the massive garbage problems in Yellowstone Park, which reduced the habituation of bears to human foods—a pattern that often leads to grizzly deaths”. As a result, the Yellowstone grizzly population has more than doubled. In order to measure the success of more species besides the grizzly bear, the Center for Biological Diversity tested the recovery rate of 110 listed species. The result was a remarkable ninety percent.

One of the biggest reasons for bald eagle death in California is the DDT. DDT is a pesticide that farmers and ranchers used to stop bugs from eating their food. After that, something terrible happened. The animals started eating the plants with the DDT on them. Also, it poisons the birds which makes that eagle eggs very thin.

Both subspecies of the spotted-tailed quoll are categorized as “near threatened” by the International Union for the Conservation of Nature, but the species as a whole were classified as Vulnerable on the IUCN Red List, following dramatic population losses. The Wildscreen Arkive states on the topic:

The spotted owl was seen as a symbol of all things environmental during the late 1980's and early 1990's. The logging industry was well on its way to destroying most of the old growth forests of the Pacific Northwest. Environmentalists swarmed the area, sabotaging logging efforts and calling

Taylor (1994) suggest that ecosystems at high altitude are beneficial for the barn owl, although habitats which consist of an abundance of vegetation for instance, rough grasslands also aid the barn owl’s population and survival as the reproduction increase within the prey species. RSPB (2016) supported the claim by stipulating that the rodent’s population flourishes within rough grasslands and the ecosystems edges enable hunting opportunities to occur more frequently as the specie have the ability to perch on the posts and fences. Sources which disagree with Taylor (1994) statement could not be located however the Barn Owl Trust (2012) states the species are susceptible to pesticide poisoning when inhabiting within agricultural lands. Even

Dreiss, et al (2012) suggests that female barn owls colour preferences within an ecosystem is associated to their colouration, however males do not exhibit habitat preferences in relation to the colour. Females have numerous pheomelanic phenotypes so their offspring must be produced within an ecosystem which aids her specific colour type (Dreiss, et al, 2012). Conclusive evidence supports the statement, The Barn Owl Trust (2016) stipulated the colouration enables the species to camouflage in their ecosystem for survival. However, Roulin et al (2000) claims the female’s colouration aids reproductive success because males have more of a sexual preference towards females which display more black spots. Both theories have sufficient evidences and

Pollution is one negative environmental factor that has had a huge impact on many of the bird populations around the world. The effects of global warming are predicted to affect approximately 11% of the bird species throughout the world. Rising levels of the ocean will also have an effect on many of the coastal bird species in North America. Because many coastal birds

The main goal of the project was to take measurements and band un-banded Boreal and Northern Saw-whet Owls at the Beaverhill Bird Observatory (BBO) located near Tofield. The bands are lightweight and contain a 9-digit number that is unique to North America. They are placed around the leg of the bird. Banding owls is an incredible experience that is conducted to keep an eye on owl populations. In addition, repetitive banding efforts allow owl populations to be compared (Grigg 1991). Conservation biologists can look-up currently banded owls and find information about where and when it was banded and how it has changed. “Measurements taken include weight, natural and flattened wing chord, and tail length.”(USF&WS 1977)” (Grigg 1991). Our objective

Despite the increased population in Japan, the continental Asian population continues to decline. There are various causes leading to the decline of their populations. The major threat is the loss and degradation of wetlands in its breeding and wintering grounds. These areas are used for conversion to agriculture, aquaculture, and industrial development. Due to habitat loss, the winter range in China is now only 8% of what it was in the 1980s. This decline of habitat also is leading to the over-concentration of cranes at a few sites. In China, wetlands are becoming drier as a result of surrounding development. In Russia and China, spring fires destroy suitable nesting grounds, allowing predators access to nests and destroying breeding

The Barn Owl’s ability to hunt almost silently comes at a cost. Their specially adapted feathers are not particularly waterproof and they are unable to store a lot of body fat. This means they are unable to hunt in heavy rain and are particularly prone to starvation during prolonged periods of severe weather and/or prey

The Federal law has protected the California condor as an endangered species since 1967 and a California state law since 1971. It was around this time that only a few dozen now remained in the wild which kicked off conservation campaigns. In efforts to save the remaining birds in the wild, they were captured and taken to zoos. Today, due to captive-breeding and successful reintroduction programs, there are 106 “mature” wild birds, with 44 of them having bred successfully. This is a

Endangered Species have been increasing as of recently and society has started questioning how the world protects it’s endangered species. The world’s biodiversity is starting to decline and future generations will never be able to appreciate some of the species that live today. Endangered species have been increasing due to habitat loss, poaching and exotic species. The United States has protected its endangered species with the Endangered Species Act, but wildlife groups and federations have started to wonder its strength.