Outdoor Ontario

Photography => Nature => Topic started by: Ally on July 28, 2020, 05:03:18 pm

Title: butterfly and frog
Post by: Ally on July 28, 2020, 05:03:18 pm
Went to Lions Valley Park in Oakville today, almost no birds (within reach). A falcon hiding in the bridge, heard a bunting and several warblers. But saw this butterfly, I think it's 2nd time I've seen this kind.
Title: Re: butterfly and frog
Post by: Ally on July 28, 2020, 05:05:56 pm
You can't see water on that pond, covered in that green plants.
Title: Re: butterfly and frog
Post by: Shortsighted on July 28, 2020, 09:09:57 pm
White Admiral butterfly. Just saw one yesterday on the Echinacea.
Green frog ... like Kermit.
Title: Re: butterfly and frog
Post by: Ally on July 28, 2020, 09:38:17 pm
Quote from: "Shortsighted"
White Admiral butterfly. Just saw one yesterday on the Echinacea.
Green frog ... like Kermit.
I didn't expect to meet Kermit personally. But why does he have a disc kind of thingy behind his eyes?
Title: Re: butterfly and frog
Post by: Howieh on July 29, 2020, 08:04:46 am
I think it's his ear. My son and I saw several bullfrogs in German Mills Park on Sunday afternoon. Not many birds or butterflies around but we did see at least 2 and probably 3 hummingbird moths nectaring on teasel.
Title: Re: butterfly and frog
Post by: Shortsighted on July 29, 2020, 10:50:08 am
Quite correct. The disc looks like a speaker and is in fact a tympanic membrane.
A surface that picks up sound waves much like the diaphragm of a microphone. It does not
need an auricle (ear cartilage) to collect and reflect the sound like we have, which would
offer some sense of direction of sound.
Frogs may have tried that route during evolution but those frogs looked ridiculous.
Mother nature does not have a sense of humour. Besides, frog ears are tuned into
low frequency sound and quite possibly infrasound and such long wavelengths have
no effective directionality. Long wavelengths tend not to reflect from an auricle
anyway thus that kind of anatomical structure would be useless because such low
frequency sound waves would just bend around a small auricular structure.
I know what you're thinking. No, not those thoughts ... the other ones. Elephants have
very large ears and yet also hear infrasound that can travel kilometers, so why the big
ears? Whales communicate with infrasound as well as higher frequencies and yet they
have no auricles either. I let you ponder that a bit.
Title: Re: butterfly and frog
Post by: Ally on July 29, 2020, 09:07:25 pm
Quote from: "Shortsighted"
Quite correct. The disc looks like a speaker and is in fact a tympanic membrane.
A surface that picks up sound waves much like the diaphragm of a microphone. It does not
need an auricle (ear cartilage) to collect and reflect the sound like we have, which would
offer some sense of direction of sound.
Frogs may have tried that route during evolution but those frogs looked ridiculous.
Mother nature does not have a sense of humour. Besides, frog ears are tuned into
low frequency sound and quite possibly infrasound and such long wavelengths have
no effective directionality. Long wavelengths tend not to reflect from an auricle
anyway thus that kind of anatomical structure would be useless because such low
frequency sound waves would just bend around a small auricular structure.
I know what you're thinking. No, not those thoughts ... the other ones. Elephants have
very large ears and yet also hear infrasound that can travel kilometers, so why the big
ears? Whales communicate with infrasound as well as higher frequencies and yet they
have no auricles either. I let you ponder that a bit.
Still pondering, this might take some time...
Title: Re: butterfly and frog
Post by: Shortsighted on July 29, 2020, 09:21:49 pm
You're young ... you have plenty of time.