Biology

The blackcap's migration pattern is an example of natural selection and genetic behavior. Blackcaps are genetically predisposed to migrate during the winter. In the past, many of the birds travel towards Portugal with a few birds traveling elsewhere, such as Britian. Now, however, more and more Blackcaps are traveling to Britian. Experts say that this because of the length of day differences in Britain over the winter. This changes migration and breeding patterns, which causes the blackcaps in Britain to return home 10 days sooner. Better nests and mates can then be selected, allowing the British birds to produce more offspring. Because of the genetic disposition to head to Britain, the offspring will do as their parents did, passing on the British gene.

Bats with full bellies will give food to starving bats to ensure the survival of that bat. When more of the species survive, more babies can be made and it is more likely the species as a whole will survive. If a bat is selfish and will not share its food with a starving bat, others will not feed it in its time of need, killing it off, creating a community of helpful bats.

Shore crabs pick mussels and other prey around their own size to eat. This ensures that it takes less time and uses less energy to get the food they need. This leaves the crabs with a net gain of energy. It also helps protect the crabs' claws from damage caused by large, hard prey. This behavioral pattern ensures the survival of the individual and species.

Some males are larger than other males. While the larger males are fighting to breed with the females, the smaller males sneak in and breed instead. Around 75% of the smaller males get to pass on their genes while only 58% of the larger guys get to.

Birds of paradise pick mates in a weird way. Males put on a show for females with bright displays of color. Females choose the males with with the best dance and brightest colors. They do this because those males are more likely healthier and better survivors. The males who do not dance as well or who are dull do not pass on their genes and die off. This ensures only the best breed.

Lionesses synchronize their "periods" so that they can all raise their cubs at the same time. Researchers believe that this helps in increasing reproductive success. This way, if something happens to one mom, another can take care of her cubs so that they don't die with her. This ensures pride survival.

The Blue Titmouse is known for stealing milk off of the doorsteps of people. It started in the early 1900s and started spreading through the flocks. These birds do this because the milk is richer than most of their diet. Robins, however, did not learn how to do this as a group. They are socially fairly independent birds. This does not allow for knowledge to be shared between Robins.

Birds imprint on whoever is raising them. When birds are living in captivity, they do not have other birds to imprint on to learn the song. They also cannot learn skills needed to survive in the world wild. All these things are learned when they develope and imprint on another bird. When they do not do this, they cannot learn these skills or the song of the other birds. Their song would be much different from the song of their flock.

Credits:

Created with images by ahisgett - "Blackcap 3a" • 3dman_eu - "flying dog bat fly" • paulbr75 - "sand crab beach wildlife" • 00dann - "Red salmon" • PublicDomainPictures - "africa animal big" • Molly258 - "Tufted Titmouse" • chapmankj75 - "Robin" • jlaswilson - "greenfinch song bird garden bird" • geralt - "town sign place name sign final"

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