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Red-eyed Vireo

Red-eyed Vireo. Vireo olivaceus. Altricial vs. Precocial Development. Super Precocial Megapodidae. Precocial ducks. Sub-precocial rails, grebes, etc. Maleo. Red-tailed Hawk. Semi-precocial gulls, terns, etc. Semi-altricial herons, hawks, etc. Altricial songbirds, etc. Continuum.

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Red-eyed Vireo

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  1. Red-eyed Vireo Vireo olivaceus

  2. Altricial vs. Precocial Development

  3. Super PrecocialMegapodidae Precocialducks Sub-precocialrails, grebes, etc Maleo Red-tailed Hawk Semi-precocialgulls, terns, etc. Semi-altricialherons, hawks, etc Altricialsongbirds, etc. Continuum

  4. Parental Nourished Parental Attendance Mobility Sight Down Examples Altricial characters Precocial characters Some do, Some do not Down: present/absent; Sight: open or closed eyes; Mobility: ambulatory or nestbound; Parental Nourishment: no/yes; Parental Attendance: no/yes

  5. Altricial Vs Precocial Development Brush Turkey at it’s mound

  6. Sibling Rivalry Vicious rivalry seems to be normal among chicks of some birds Larger siblings bully their nest mates and get first choice of food brought by parents. Great Egret nestlings are often killed by an elder sibling

  7. “Siblicide” A method of brood reduction in the nests of some eagles, skuas, herons, and boobies In the well studied Verreaux’s Eagle (right), only once in 200 records did both siblings survive to fledging stage. In most cases the older sibling deliberately killed the younger eaglet

  8. “Siblicide” Experimental size matching of brood mates in the Lesser Spotted Eagle (above) did not prevent the domination and eventual killing of one by the other

  9. In the South Polar Skua (below), the younger of 2 siblings has a chance of surviving if it is nearly the same size as the older chick. But has a poor chance if it is as little as 8g (10%) lighter than its older nest- mate Thus, small delays in hatching time place a younger chick at a competitive disadvantage with respect to its nest-mates

  10. Red-eyed Vireo Vireo olivaceus

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