Spilling off flightless forms during the Cretaceous

Home» History » Spilling off flightless forms during the Cretaceous

I am the first to admit that there are problems with this scenario of secondarily flightless protobirds. (walking dinosaur costume)The worst is that in some ways some protobirds are less birdlike than archaeopterygians and dromaeosaurs.(realistic dinosaur costume) In particular, oviraptors, ostrich-mimics, troodonts, and avimimids seem to have normal and vertical pubes like most theropods. Perhaps this is a reversal, for unlike birds, proper protobirds still had good tails and pubes that were behind the zuts instead of on either side of them. If thev reenlarged their tails, they no longer needed the belly under the hips for balance, so it might have been swung forward again along with the supporting pubes.

 

There may have been fewer cases of secondary flight loss in the protobird clade than I suspect. Instead, the nonflying protobirds may have experienced massive parallelism with the main body of flying protobirds. Another possibility is that flying protobirds continued as their own clade, competing with the true birds (including, possibly, "Protoavis") and spilling off flightless forms during the Cretaceous.

 

A vital point about bird origin is that the increasrngly avian design of Archceopterry and cretaqeous protobirds makes them, in the whole, the best potential ancestors of birds, much better than protobirds.聽(Animatronic dinosaur)

 

Best Animatronic Dinosaur Manufacturer

 

Animatronic Dinosaur Packaging and shipping
Related Products List
  • Product List

  • Contact Us

    E-mail: info@realdinosaur.com

    E-mail: dinosaurmodel@gmail.com

    Phone: +86-15881309412

    Tel: +86-813-5204450

    Skype ID: real-dinosaur

  • Leave a Message Online

    * indicates required field
  • Production Process

    Production Process of animatronic dinosaur
  • zigong animatronic dinosaur factory

    Zigong real dinosaur science and technology co., ltd will export animatronic dinosaur and animatronic animal models approximately 2000 pcs annually, the export markets spread over 30 countries, in comparison, we prefer to call them the artwares or handicrafts.

    • realdinosaur's youtube
    • realdinosaur's facebook
    • realdinosaur's twitter
    • realdinosaur's google+
    recent posts produts list contact realdinosaur

    E-mail: info@realdinosaur.com

    E-mail: dinosaurmodel@gmail.com

    Phone: +86-1588-1309-412

    Skype ID: real-dinosaur

    Address: No.17, Bancang Industrial Park, High-Tech Development Zone, Zigong, Sichuan, China