Large difference between low and high 95% CI home range

[Megan Spina]

Hi team,

I'm constructing nesting home ranges for a bird species and one of the nesting home ranges is HUGE compared to the others (679km^2), and I noticed the low 95% CI limit is 108km^2 and the high is 1761km^2.  This is a very large difference and I wondering why that may be?  This particular nesting period for this individual spans 17 days with 166 fixes.  I've attached the plot below.

Thank you!

[Allie Anderson]

Hi Megan,

What is the type of tracking data you are using? Sometimes I’ve had very large CI’s when data were Argos but the LC classes were mostly low quality (A’s and B’s)

Just an idea!

Allie

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[Megan Spina]

Hi Allie,

I'm using GPS-GSM transmitters from Ornitela!

On Mon, Jan 26, 2026 at 8:00 AM Allie Anderson <aand...@gmail.com> wrote:

Hi Megan,

What is the type of tracking data you are using? Sometimes I’ve had very large CI’s when data were Argos but the LC classes were mostly low quality (A’s and B’s)

Just an idea!

Allie

On Sunday, January 25, 2026, Megan Spina <megan...@gmail.com> wrote:

Hi team,

I'm constructing nesting home ranges for a bird species and one of the nesting home ranges is HUGE compared to the others (679km^2), and I noticed the low 95% CI limit is 108km^2 and the high is 1761km^2.  This is a very large difference and I wondering why that may be?  This particular nesting period for this individual spans 17 days with 166 fixes.  I've attached the plot below.

Thank you!

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[Stephen Blake]

Dear Megan,

 

How are the Ornitela tags workout out for your study?

Thanks

Steve Blake

 

From: ctmm...@googlegroups.com <ctmm...@googlegroups.com> On Behalf Of Megan Spina
Sent: Monday, January 26, 2026 10:54 AM
To: Allie Anderson <aand...@gmail.com>
Cc: ctmm R user group <ctmm...@googlegroups.com>
Subject: [External] Re: [ctmm-user] Large difference between low and high 95% CI home range

 

Hi Allie, I'm using GPS-GSM transmitters from Ornitela! On Mon, Jan 26, 2026 at 8: 00 AM Allie Anderson <aande763@ gmail. com> wrote: Hi Megan, What is the type of tracking data you are using? Sometimes I’ve had very large CI’s when data

Hi Allie,

 

I'm using GPS-GSM transmitters from Ornitela!

 

On Mon, Jan 26, 2026 at 8:00 AM Allie Anderson <aand...@gmail.com> wrote:

Hi Megan,

 

What is the type of tracking data you are using? Sometimes I’ve had very large CI’s when data were Argos but the LC classes were mostly low quality (A’s and B’s)

 

Just an idea!

Allie

On Sunday, January 25, 2026, Megan Spina <megan...@gmail.com> wrote:

Hi team,

 

I'm constructing nesting home ranges for a bird species and one of the nesting home ranges is HUGE compared to the others (679km^2), and I noticed the low 95% CI limit is 108km^2 and the high is 1761km^2.  This is a very large difference and I wondering why that may be?  This particular nesting period for this individual spans 17 days with 166 fixes.  I've attached the plot below.

 

Thank you!

 

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[Megan Spina]

Hi Steve,

They're okay!  Lots of them have very low battery already and we deployed them this summer.  It may have to do with our harness design, but we also may have gotten a bad batch last year - we aren't sure and are looking into it.  However, I used the Ornitela leg bands on cranes previously and they worked great!

[Stephen Blake]

Thanks Megan,

 

We are going to deploy some of these on red tailed hawks soon. Will let you know how ours work out. And please keep us posted on yours

 

Thanks!!

 

steve

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