A span of about five days can be the interval between egg laying for Blue-footed boobies. The average number of eggs laid by blue-footed boobies are two. Obviously the oldest egg hatches first in this type scenario.
The Red-footed Boobies are suffering from human related causes. These are major factors in the decline of the Red-footed Booby, their nesting sites are being destroyed by the coastal growth. The clearing of trees and brush from the coast lines leaves the Booby with no place to nest. The Booby is also suffering from over fishing by the commercial fishing industry, which is depleting the common food sources of the Booby. These birds feed at sea, and suffer from pollution, which includes oil spills, and trash that is being dumped in our oceans, along with the toxins ingested from the fish they eat. Despite these hazards the Red-footed Booby is not listed as 'endangered', according to the International Union of Conservation for Nature, or IUCN Red List, they are listed with a status of 'least concern'.
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For more details, please see the sites listed below. The black footed ferrets worst enemy is man, and they are losing that battle. As more prairie land is plowed and destroyed, along with the continued eradication of prairie dogs, the black footed ferrets cannot survive and die because man has cut off their main food source and habitat.. Black Fo oted Ferret's Endangerment from Loss of Habitat and Food Source. Black-footed ferrets survival depends on prairie dogs for food and shelter. At one time they were thought to be instinct in the wild caused indirectly from loss of prairie grassland habitat and loss of their main found source - the prairie dog, which was subject to massive extermination by the government and ranchers in the early 1900's.
Prairie dogs were exterminated, poisoned and killed by the millions. The prairie dog is considered nuisance and ranchers viewed them as potential problems for cattle or horses being injured by stepping into prairie dog holes or burrows.
Which is a big lie - there has not been one documented case of cattle or horse being injured by stepping into a prairie dog burrow or hole. Prairie dogs are beneficial for the land and their activity helps aerate the grassland to grow.. In the early 1900's when Americans moved out west, Prairie Dogs were considered pest and it was thought they would destroy land with their tunnels, so they were eradicated along with their habitat. Ranchers see the prairie dog as a competitor for the grass that cattle eat, so they have poisoned prairie dogs with harmful chemicals that sometimes killed other animals. Also, many prairie dog towns have been plowed over for crop fields or destroyed for human development where the black footed ferret lived. Diseases, like sylvatic plague have also reduced prairie dog populations. Scientists estimated we have lost as much as 98% of the prairie dog habitat that once existed..
The black-footed ferret's close association with prairie dogs was an important factor in its decline. Contributions to the near-extinction of Black Footed Ferrets during the 19th and 20th centuries include the loss of prairie grassland habitat, the reduction of prairie dog numbers (through both habitat loss and poisoning), and the effects of canine distemper and sylvatic plague. As human encroachment and other factors reduced the populations of prairie dogs, and the food source began to disappear, so did black footed ferrets. Several non-biological challenges also face ferret recovery. Antipathy for prairie dogs remains prevalent among some people, especially relevant groups such as ranchers and many employees of agriculture, wildlife, and public land management agencies (Miller et al.