“…For example, some hosts use the range and distribution of egg colors and patterns in the nest to make rejection decisions (Bán, Moskát, Barta, & Hauber, 2013;Moskát, Avilés, Bán, Hargitai, & Zölei, 2008). The variation of egg color in a clutch may be driven by the extent of the host's intraclutch variability (Moskát et al, 2008) or differences in the parasite-tohost egg ratio, due to single vs. multiple parasitism and/or variation in host clutch size (Manna et al, 2019;Moskát et al, 2009;Stevens, Troscianko, & Spottiswoode, 2013, but see Lang, Bollinger, & Peer, 2014). Hosts may respond differently to nests with varying parasite-to-host egg ratio not only because of the variation in color, but also because of the Weber's law, which posits that the ability of animals to discriminate between stimuli depends on the stimulus proportionality (Stevens, 1975).…”