![Conceptuu on Twitter: "was originally going to use the reference of a porcupine & a frigatebird to make a Therizinosaurus didn't do that since I wasn't really satisfied with most of the Conceptuu on Twitter: "was originally going to use the reference of a porcupine & a frigatebird to make a Therizinosaurus didn't do that since I wasn't really satisfied with most of the](https://pbs.twimg.com/media/FSrcPtLUcAAyM4E.jpg:large)
Conceptuu on Twitter: "was originally going to use the reference of a porcupine & a frigatebird to make a Therizinosaurus didn't do that since I wasn't really satisfied with most of the
![Brian Engh on Twitter: "These air sacs are also important for display and sound making! Air sacs have evolved into elaborated socio-sexual display structures in multiple groups of birds >independently< https://t.co/tZ0hfL1zbr" / Brian Engh on Twitter: "These air sacs are also important for display and sound making! Air sacs have evolved into elaborated socio-sexual display structures in multiple groups of birds >independently< https://t.co/tZ0hfL1zbr" /](https://pbs.twimg.com/tweet_video_thumb/FOnw18xXIAMQUze.jpg)
Brian Engh on Twitter: "These air sacs are also important for display and sound making! Air sacs have evolved into elaborated socio-sexual display structures in multiple groups of birds >independently< https://t.co/tZ0hfL1zbr" /
![🔥 A frigatebird, a bird, which male bird's inflatable neck bag, red is used to attract an inflatable bag for the bird of a companion. : r/NatureIsFuckingLit 🔥 A frigatebird, a bird, which male bird's inflatable neck bag, red is used to attract an inflatable bag for the bird of a companion. : r/NatureIsFuckingLit](https://external-preview.redd.it/wTBoq7wNjcMGfWTwb1G9JKYJWMCVHokZ1qkrkevTYRw.png?format=pjpg&auto=webp&s=cd4ffff3ddf2b8f981e23653a5e2d81fc0e233ce)