- #1,961
BillTre
Science Advisor
Gold Member
- 2,535
- 10,166
A cool looking fish:
Yeah. What is it?BillTre said:
JWST sunshield test fish.Ibix said:Yeah. What is it?
No 1: A tradie spider (Buttkraqus Offensicus).Drakkith said:Gotta ask the tough questions sometimes.
[If a spider wore pants...]
I think humming birds are very cool and beautiful animals. I've never seen one in real life.Klystron said:Several species of humming birds flew top cover this morning over the swimming pools
Edit: I think this is a Junco, not a robin.Klystron said:robins
Klystron said:Several species of humming birds flew top cover this morning over the swimming pools, hunting tiny flying insects. An Anna's hummingbird couple hovered around a grackle couple building a nest in a palm tree, seeking small bugs disturbed by the nest building. The hummers nest high in an ash tree. Also saw unpaired robins who appear unafraid of the grackles but keep apart. Have not spotted finches yet.
Hummingbirds seem to fear nothing despite their small size; predators that they are.
Hummingbirds split from their sister group, the swifts and treeswifts, around 42 million years ago. The common ancestor of extant hummingbirds is estimated to have lived 22 million years ago.
Showing off they flying abilities for selection among by the females I guess.Most male hummingbirds attract a female with their rather feeble song. In a few species the males perform complex aerial displays.
Hummingbirds have the highest mass-specific metabolic rate of any homeothermic animal.[3] To conserve energy when food is scarce and nightly when not foraging, they can go into torpor, a state similar to hibernation, and slow their metabolic rate to 1/15 of its normal rate.[4]
There is one hereKlystron said:Hummingbird
Yeah, I had no idea about that either until I saw the post here. My wife loves her hummingbird feeder on our deck, and even has a "Hummingbird Cam" WiFi camera watching it.BillTre said:I had to look this up since I was only aware of humming birds as nectar eaters.
But yes, they eat insects too (wiki link here)!
Oh wow, amazing photography. Thanks for sharing!Keith_McClary said:There is one here
Bird Photographer of the Year 2021 finalists revealed
as well as some (much) larger birds.
Superb photos. I really liked this one:Keith_McClary said:There is one here
Bird Photographer of the Year 2021 finalists revealed
as well as some (much) larger birds.
Yeah, I was wondering if it was his grandfather who opened that window in the first place...DennisN said:Superb photos. I really liked this one:
Swallow, Lincolnshire, UK, by David White
I remember I ordered a photo print of one many years ago because they can be so beautiful.DennisN said:I think humming birds are very cool and beautiful animals. I've never seen one in real life.
Wait... so its eyes would seem to follow you round the room?BillTre said:An insect "hiding":
View attachment 281436
The black spots are the pseudo-pupils of the compound eyes. It is the ommatidia (individual eye units of the compound eye) where you are looking down the tube of the ommatidia (they lookk black). The ommatidia are radially arrayed in the compound eye.
Yes.Ibix said:Wait... so its eyes would seem to follow you round the room?
BillTre said:The Phantom Anglerfish (Haplophryne mollis) belongs to a group of anglerfish known as the "Ghostly Seadevils."
DennisN said:Anglerfish are very cool.
By the way, @BillTre , if I remember correctly you've also taken your own photos of fish.
You don't have any photos you'd like to share here?
I would be interested in seeing them.
Thanks for sharing!BillTre said:OK. Here are some pictures:
All of those small containers (I don't know what they are called), are they for breeding or keeping fish, or both, perhaps?BillTre said:One of the ~15 isles in one of the U of O fishrooms:
Each can keep/raise about 20 zebrafish. The rack provides the infrastructure for each tank (water, air, return water flow to filter). The tanks are about 1 gallon. There are smaller tanks (~1 Liter) for raising young fish and other 1 liter tanks in which the fish can be crossed and eggs collected. We would get about 1 million eggs/year.DennisN said:All of those small containers (I don't know what they are called), are they for breeding or keeping fish, or both, perhaps?
My set-up is a variant of his, which is well known. I have a little book on it that he made.BigDon said:Dr. Axelrod developed a wonderful technique for photographing small live fish.
Your setup is halfway there. An acrylic vessel eight by eight inches and 3/4 of an inch deep, (front to back), with a black backing. Fish can swim up and down, but still stay in the focal plane of the camera.
Your average plastics shop can make one in a hour.
There are now about 3 species of pearl danios recognized, with slight differences in coloration. Many new Danios have been identified in the last twenty years. (Its a Danio-fest!).BigDon said:Have you seen non-albino pearl danios? I think they're the prettiest of the lot.
They often don't know much about the obscure fish they haveBigDon said:Chicanery is very common in fish wholesalers I've found.
Actually, it didn't smell bad. Filtration kept the water good and we had a great HVAC system.BigDon said:Also...
I can just look at that bottom picture and I already know what that room smells like.