Distribution:
Throughout its continental range Cope’s Gray Treefrog often can be found sympatrically with the Gray Treefrog (Hyla versicolor), which is virtually identical in appearance. The primary difference is their chromosome number; H. chrysoscelis has two sets of chromosomes (diploid) while H. versicolor has four (tetraploid). Another difference is the trill rate with H. versicolor having a lower-pitched, slower trill rate than H. chrysoscelis. Their ranges are generally reported as a single range from southern Maine south to the Florida panhandle, west to the eastern half of Texas, and north again to southern Manitoba. In Nebraska they are found in southeastern counties although individuals have been collected and observed in isolated localities in more northern and western counties. It is probable that the Lincoln County record is the result of an introduction, but occurrences in Knox County to the north are probably naturally-occurring. These came from relatively remote localities and specimens exist from adjacent counties across the river in South Dakota. Currently, only H. chrysoscelis is known to exist in Nebraska; however, H. versicolor likely occurs here as well. The range of treefrogs in Nebraska is expected to expand as prairie streams begin to become more wooded environments.
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• Occurrence Summary:  
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  Other Observations 

Some county occurrences indicated below may be too imprecise to map above.
County Breakdown: County Name (# occurrences):

Natural History:
Riparian woodlands and oak savannas near temporary and permanent bodies of water are the most common habitat for Cope’s Gray Treefrogs in Nebraska. These are truly arboreal frogs, spending daylight hours sleeping on tree leaves and other vegetation as well as inside holes in branches and tree trunks. They also have been observed using corn stalks where corn fields are adjacent to woodlands as well as the shaded eaves of houses. Breeding begins in mid-April and continues through June. The male’s call is a very short trill that lasts only a few seconds. Tadpoles are brightly colored with red to rust-colored tails. Metamorphosis occurs in July and August when tailed froglets leave the water and climb onto vegetation where they absorb the remainder of their tails.

Occurrence Activity:

Chorusing:

Audio recording by Keith Coleman.

Chorusing Phenology: The black outlined dots denote the Julian date (day of the year; 1 January = 1 to 31 December = 365) an observation was made. The thin red line depicts the range of dates between the beginning of the first, and end of the fourth quartile (excluding outliers; Tukey method). The thick light blue bar represents the second and third quartile (interquartile range; the middle 50% of all observations). Only one observation per Julian date is included in the graphs; so a date with multiple observations carries the same weight as a date with only one observation. The vertical bars correspond to the 12 months of the year; January through December.
# Unique Obervations: ; Range: ; Interquartile range: ;

Remarks: